Spain's Rafael Nadal hits a forehand return to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal prepares to serve to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Norway's Casper Ruud, right, packs his bag as he reties in his fourth round match against Russia's Andrey Rublev, left, at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Spain's Rafael Nadal hits a backhand return to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal prepare to serve to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Norway's Casper Ruud packs his bag as he retires in his fourth round match against Russia's Andrey Rublev at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Spain's Rafael Nadal hits a backhand return to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Norway's Casper Ruud walks off the court as he retires in his fourth round match against Russia's Andrey Rublev at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Norway's Casper Ruud walks off the court as he retires in his fourth round match against Russia's Andrey Rublev at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Norway's Casper Ruud walks off the court as he retires in his fourth round match against Russia's Andrey Rublev at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Italy's Fabio Fognini hits a backhand return to Spain's Rafael Nadal during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal hits a backhand return to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Norway's Casper Ruud walks off the court as he retires in his fourth round match against Russia's Andrey Rublev at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Italy's Fabio Fognini hits a backhand return to Spain's Rafael Nadal during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal hits a backhand return to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Italy's Fabio Fognini hits a backhand return to Spain's Rafael Nadal during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Russia's Andrey Rublev bites the ball after losing a point on his serve to Norway's Casper Ruud during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Spain's Rafael Nadal serves to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Russia's Andrey Rublev bites the ball after losing a point on his serve to Norway's Casper Ruud during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Russia's Andrey Rublev prepares to serve to Norway's Casper Ruud during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Norway's Casper Ruud hits a backhand to Russia's Andrey Rublev during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Spain's Rafael Nadal hits a forehand return to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Norway's Casper Ruud hits a forehand to Russia's Andrey Rublev during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Norway's Casper Ruud hits a forehand to Russia's Andrey Rublev during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Norway's Casper Ruud hits a backhand to Russia's Andrey Rublev during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Norway's Casper Ruud hits a backhand to Russia's Andrey Rublev during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Italy's Fabio Fognini hits a backhand return to Spain's Rafael Nadal during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal hits a backhand return to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Russia's Andrey Rublev hits a backhand to Norway's Casper Ruud during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Russia's Andrey Rublev hits a forehand to Norway's Casper Ruud during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Spain's Rafael Nadal hits a backhand return to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal serves to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Russia's Andrey Rublev hits a forehand to Norway's Casper Ruud during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Norway's Casper Ruud serves to Russia's Andrey Rublev during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Italy's Fabio Fognini hits a backhand return to Spain's Rafael Nadal during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal serves to Italy's Fabio Fognini in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal celebrates after defeating Italy's Fabio Fognini in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal celebrates after defeating Italy's Fabio Fognini in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal celebrates after defeating Italy's Fabio Fognini in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal celebrates after defeating Italy's Fabio Fognini in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal is interviewed after defeating Italy's Fabio Fognini in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal, right, is congratulated by Italy's Fabio Fognini after winning their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal is interviewed after defeating Italy's Fabio Fognini in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Spain's Rafael Nadal hits a forehand to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Spain's Rafael Nadal hits a backhand to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Spain's Rafael Nadal hits a forehand to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Spain's Rafael Nadal serves to Italy's Fabio Fognini during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Italy's Fabio Fognini hits a forehand to Spain's Rafael Nadal during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Italy's Fabio Fognini hits a forehand to Spain's Rafael Nadal during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Belgium's Elise Mertens hits a forehand to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Belgium's Elise Mertens hits a backhand to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova serves to Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova hits a backhand to Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova hits a forehand to Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova hits a forehand to Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Belgium's Elise Mertens hits a forehand to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Belgium's Elise Mertens hits a forehand to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova hits a backhand to Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova hits a backhand to Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Belgium's Elise Mertens hits a forehand to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Belgium's Elise Mertens hits a forehand to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Belgium's Elise Mertens celebrates winning a point against Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova celebrates winning a point against Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova wipes her face while playing against Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Belgium's Elise Mertens hits a backhand to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Belgium's Elise Mertens hits a forehand to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Italy's Matteo Berrettini, right, is interviewed by former Australian player Todd Woodbridge after he withdrew from his fourth round match against Greece's Stefanos Tsitsipas with an injury at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Belgium's Elise Mertens hits a forehand to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Australia's Ash Barty hits a backhand return to United States' Shelby Rogers during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Czech Republic's Karolina Muchova hits a forehand to Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova hits a forehand to Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova hits a forehand to Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova crouches down while playing Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Australia's Ash Barty serves to United States' Shelby Rogers during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Australia's Ash Barty hits a forehand return to United States' Shelby Rogers during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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United States' Shelby Rogers serves to Australia's Ash Barty during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Belgium's Elise Mertens hits a forehand to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova hits a forehand to Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Belgium's Elise Mertens hits a forehand to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Australia's Ash Barty serves to United States' Shelby Rogers during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Czech Republic's Karolina Muchova serves to Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Australia's Ash Barty hits a forehand return to United States' Shelby Rogers during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Australia's Ash Barty hits a backhand return to United States' Shelby Rogers during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Belgium's Elise Mertens drops her head after playing a point against Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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United States' Shelby Rogers hits a forehand return to Australia's Ash Barty during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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United States' Shelby Rogers hits a backhand return to Australia's Ash Barty during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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United States' Shelby Rogers serves to Australia's Ash Barty during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Czech Republic's Karolina Muchova hits a forehand to Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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United States' Shelby Rogers hits a forehand return to Australia's Ash Barty during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Belgium's Elise Mertens serves to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Australia's Ash Barty serves to United States' Shelby Rogers during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Czech Republic's Karolina Muchova adjusts her headband while resting during her fourth round match against Belgium's Elise Mertens at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova hits a forehand to Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova celebrates winning a point against Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Belgium's Elise Mertens hits a backhand to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Australia's Ash Barty hits a backhand return to United States' Shelby Rogers during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Australia's Ash Barty hits a backhand return to United States' Shelby Rogers during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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United States' Shelby Rogers hits a backhand return to Australia's Ash Barty during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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United States' Shelby Rogers reacts during her fourth round match against Australia's Ash Barty at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Belgium's Elise Mertens hits a forehand to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Belgium's Elise Mertens hits a forehand to Czech Republic's Karolina Muchova during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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United States' Shelby Rogers hits a backhand return to Australia's Ash Barty during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Australia's Ash Barty hits a backhand return to United States' Shelby Rogers during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Czech Republic's Karolina Muchova hits a forehand to Belgium's Elise Mertens during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Australia's Ash Barty wipes the sweat from her face during her fourth round match against United States' Shelby Rogers at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Czech Republic's Karolina Muchova celebrates her win over Belgium's Elise Mertens in their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova celebrates her win over Belgium's Elise Mertens in their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova celebrates her win over Belgium's Elise Mertens in their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova celebrates her win over Belgium's Elise Mertens in their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Czech Republic's Karolina Muchova celebrates her win over Belgium's Elise Mertens in their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Monday, Feb. 15, 2021. (AP Photo/Hamish Blair)
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Australia's Ash Barty hits a forehand return to United States' Shelby Rogers during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Australia's Ash Barty celebrates after defeating United States' Shelby Rogers during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Australia's Ash Barty celebrates after defeating United States' Shelby Rogers during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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United States' Shelby Rogers waves as she leaves Rod Laver Arena following her fourth round loss to Australia's Ash Barty at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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United States' Shelby Rogers, left, congratulates Australia's Ash Barty after their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Australia's Ash Barty is interviewed following her win over United States' Shelby Rogers in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Australia's Ash Barty is interviewed following her win over United States' Shelby Rogers in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Australia's Ash Barty is interviewed following her win over United States' Shelby Rogers in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Australia's Ash Barty is interviewed following her win over United States' Shelby Rogers in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Australia's Ash Barty reacts as she is interviewed following her win over United States' Shelby Rogers in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Feb. 15, 2021.(AP Photo/Andy Brownbill)
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Taiwan's Hsieh Su-Wei arrives on court for her fourth round match against Marketa Vondrousova of the Czech Republic at the Australian Open tennis championships in Melbourne, Australia, Sunday, Feb. 14, 2021. (AP Photo/Andy Brownbill)
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Marketa Vondrousova of the Czech Republic arrives on court for her fourth round match against Taiwan's Hsieh Su-Wei at the Australian Open tennis championships in Melbourne, Australia, Sunday, Feb. 14, 2021. (AP Photo/Andy Brownbill)
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Japan's Naomi Osaka walks onto the court for her fourth round match against Spain's Garbine Muguruza at the Australian Open tennis championship in Melbourne, Australia, Sunday, Feb. 14, 2021.(AP Photo/Hamish Blair)
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Japan's Naomi Osaka serves to Spain's Garbine Muguruza during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Feb. 14, 2021.(AP Photo/Hamish Blair)
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Japan's Naomi Osaka hits a forehand return to Spain's Garbine Muguruza during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Feb. 14, 2021.(AP Photo/Hamish Blair)
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Marketa Vondrousova of the Czech Republic hits a forehand to Taiwan's Hsieh Su-Wei during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Sunday, Feb. 14, 2021. (AP Photo/Andy Brownbill)
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Japan's Naomi Osaka hits a backhand return to Spain's Garbine Muguruza during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Feb. 14, 2021.(AP Photo/Hamish Blair)
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Marketa Vondrousova of the Czech Republic hits a backhand to Taiwan's Hsieh Su-Wei during their fourth round match at the Australian Open tennis championships in Melbourne, Australia, Sunday, Feb. 14, 2021. (AP Photo/Andy Brownbill)