Caroline Wozniacki of Denmark hits a return to Lesia Tsurenko of Ukraine during their women's singles match. -Photo by Reuters

A match official walks on court. -Photo by Reuters

Jo-Wilfried Tsonga of France celebrates defeating Blaz Kavcic of Slovenia in their men's singles match. -Photo by Reuters

Sloane Stephens of the US makes a backhand return to Britain's Laura Robson during their third round match. -Photo by AP

Britain's Andy Murray celebrates after defeating Lithuania's Ricardas Berankis in their third round match. -Photo by AP

Mirka Federer, wife of Roger Federer of Switzerland, takes pictures with her camera during his men's singles match against Bernard Tomic of Australia. -Photo by Reuters

Supporters of Australia's Bernard Tomic pose for photographers as they cheer him on while watching his third round match against Switzerland's Roger Federer on a giant screen outside the Rod Laver Arena. -Photo by AP

Federer serves to Australia's Bernard Tomic during their third round match. -Photo by AP

Switzerland's Roger Federer makes a backhand return to Australia's Bernard Tomic. -Photo by AP

Former Australian cricketer Shane Warne (R) and British actress Elizabeth Hurley speak as Switzerland's Roger Federer plays during his men's singles match against Australia's Bernard Tomic. -Photo by AFP

France's Gilles Simon (R) embraces compatriot Gael Monfils after victory in his men's singles match on the sixth day of the Australian Open. -Photo by AFP