
Serena Williams of the United States eyes the ball as she returns to Daria Kasatkina of Russia during their third round match at the Australian Open tennis championships in Melbourne, Australia, Friday, Jan. 22, 2016.(AP Photo/Aaron Favila)
Serena Williams of the United States eyes the ball as she returns to Daria Kasatkina of Russia during their third round match at the Australian Open tennis championships in Melbourne, Australia, Friday, Jan. 22, 2016.(AP Photo/Aaron Favila)