Japan's Naomi Osaka and Spain's Garbine Muguruza, left, play their fourth round match on Rod Laver Arena at the Australian Open tennis championship in Melbourne, Australia, Sunday, Feb. 14, 2021.The Australian Open continues but without crowds after the Victoria state government imposed a five-day lockdown starting Saturday in response to a COVID-19 outbreak at a quarantine hotel.(AP Photo/Hamish Blair)