Maria Sharapova of Russia hits a return to Kirsten Flipkens of Belgium during their women's singles match at the Australian Open tennis tournament. Damir Sagolj/Reuters
David Ferrer of Spain celebrates defeating Kei Nishikori of Japan in their men's singles match at the Australian Open tennis tournament. Tim Wimbourne/Reuters
Serena Williams of the U.S. serves to Garbine Muguruza of Spain during their women's singles match at the Australian Open tennis tournament. David Gray/Reuters
Michelle Larcher De Brito of Portugal throws her racket during her women's singles match against Ekaterina Makarova of Russia at the Australian Open tennis tournament in Melbourne. Toby Melville/Reuters
Andy Murray of Britain serves to Robin Haase of Netherlands during their men's singles match at the Australian Open tennis tournament in Melbourne. Toby Melville/Reuters
Nicolas Almagro of Spain serves to Steve Johnson of the U.S. during their men's singles match at the Australian Open tennis tournament in Melbourne. Navesh Chitrakar/Reuters