Andy Murray makes a backhand return to Robin Haase during their first-round match at the Australian Open in Melbourne, Australia, on Jan. 15, 2013. (Associated Press)
Serbia's Novak Djokovic hits a forehand return to France's Paul-Henri Mathieu during their first round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 14, 2013. (AP Photo/Andrew Brownbill)
Serbia's Novak Djokovic and Serena Williams of the US perform the gangnam style dance during the Kids Tennis Day at Melbourne Park ahead of the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 12, 2013. (AP Photo/Andy Wong)
Serena Williams of the United States reacts after winning a point during her quarterfinal match against her compatriot Sloane Stephens at the Brisbane International tennis tournament held in Brisbane, Australia, Thursday, Jan. 3, 2013. (AP Photo/Tertius Pickard)
Serena Williams of the U.S. plays a shot in her match against Alize Cornet of France during the Brisbane International tennis tournament in Brisbane, Australia, Tuesday, Jan 1, 2013. (AP Photo/Tertius Pickard)
Jarrod McKenna of Perth, Australia, jumps down from a wall after taking a photograph of the Martin Luther King Jr. National Memorial on Tuesday, the day the Department of the Interior announced it will remove the controversial truncated “drum major” quote on the side of the memorial rather than replace it with the full quote. (Andrew Harnik/The Washington Times)
San Antonio Spurs guard Patty Mills (8), from Australia, and center DeJuan Blair (45) guard Washington Wizards guard A.J. Price (12) as he passes the ball in the first half of an NBA basketball game Monday, Nov. 26, 2012, in Washington. (AP Photo/Alex Brandon)
The shadow of U.S. Secretary of State Hillary Rodham Clinton is seen as she speaks Nov. 13, 2012, at University of Western Australia in Perth, Australia. (Associated Press)
Alistair Presnell, of Australia, during the first round of the U.S. Open Championship golf tournament Thursday, June 14, 2012, at The Olympic Club in San Francisco. (AP Photo/Ben Margot)
Victoria Azarenka, of Belarus, left, shakes hands with Samantha Stosur, of Australia, after winning their quarterfinals match of the 2012 US Open tennis tournament, Tuesday, Sept. 4, 2012, in New York. (AP Photo/Mike Groll)
Andy Roddick reacts after beating Australia's Bernard Tomic in the third round of play at the 2012 US Open tennis tournament, Friday, Aug. 31, 2012, in New York. (AP Photo/Charles Krupa)