Norway's Marit Bjoergen, center, falls on the finish straight as Slovenia's Katja Visnar, left, and Germany's Denise Herrmann pass by during a women's semifinal of the cross-country sprint at the 2014 Winter Olympics, Tuesday, Feb. 11, 2014, in Krasnaya Polyana, Russia. (AP Photo/Matthias Schrader)

Norway's Marit Bjoergen, right, falls as Slovenia's Katja Visnar passes by during their women's semifinal heat of the cross-country sprint at the 2014 Winter Olympics, Tuesday, Feb. 11, 2014, in Krasnaya Polyana, Russia. (AP Photo/Matthias Schrader)

Norway's Marit Bjoergen (C) falls as Slovenia's Katja Visnar (L) and Germany's Denise Herrmann sprint during the Women's Cross-Country Skiing Individual Sprint Free Semifinals at the Laura Cross-Country Ski and Biathlon Center during the Sochi Winter Olympics on February 11, 2014 in Rosa Khutor near Sochi. AFP PHOTO / ALBERTO PIZZOLI