FILE PHOTO: Williams of the U.S. reacts after being hit

FILE PHOTO: Williams of the U.S. reacts after being hit by a ball during her final match against Germany's Kerber at the Australian Open tennis tournament at Melbourne Park

FILE PHOTO: Serena Williams of the U.S. reacts after being hit by a ball during her final match against Germany’s Angelique Kerber at the Australian Open tennis tournament at Melbourne Park, Australia, January 30, 2016. REUTERS/Jason Reed/File Photo