Maria Sharapova of Russia celebrates her victory over Jamie Hampton of the US in their women's singles second round match on day four of the 2012 Australian Open. Sharapova won 6-0, 6-1. – AFP Photo.

Ana Ivanovic of Serbia (R) shakes hands after victory in her women's singles match against Michaella Krajicek of the Netherlands (L) on the fourth day of the Australian Open. Ivanovic won 6-2. 6-3. – AFP Photo.

Jo-Wilfried Tsonga of France gestures as he celebrates victory in his men's singles match against Ricardo Mello of Brazil on the fourth day of the Australian Open. Tsonga won 7-5. 6-4. 6-4. – AFP Photo.

Novak Djokovic of Serbia waves to celebrate his victory over Santiago Giraldo of Colombia in their men's singles second round match on day four of the 2012 Australian Open. Djokovic won 6-3, 6-2, 6-1. – AFP Photo.

Tatsuma Ito of Japan plays a stroke during his men's singles match against Nicolas Mahut of France on the fourth day of the Australian Open. Mahut won 1-6. 7-6. 6-2. 6-2. – AFP Photo.

Sabine Lisicki of Germany celebrates her victory over Shahar Peer of Israel in their women's singles second round match on day four of the 2012 Australian Open. Lisicki won 6-1, 6-2. – AFP Photo.

A spectator dressed in a bodysuit cheers for James Duckworth of Australia during his men's singles match against Janko Tipsarevic of Serbia on the fourth day of the Australian Open. Tipsarevic won 3-6. 6-2. 7-6. 6-4. – AFP Photo.

Marion Bartoli of France reaches for a return volley against Jelena Dokic of Australia in their women's singles second round match on day four of the 2012 Australian Open. Bartoli won 6-3, 6-2. – AFP Photo.

Lleyton Hewitt of Australia gestures after winning a point during his men's singles match against Andy Roddick of the US on the fourth day of the Australian Open. – AFP Photo.

Petra Kvitova of the Czech Republic returns a ball to Carla Suarez Navarro of Spain during their second round match at the Australian Open tennis championship, in Melbourne, Australia, Thursday, Jan. 19, 2012. – AP Photo.

Serena Williams of the US reacts during her second round match against Barbora Zahlavova Strycova of the Czech Republic at the Australian Open. – AP Photo.

Kei Nishikori of Japan celebrates after defeating Matthew Ebden of Australia in their men's singles match at the Australian Open. – Reuters Photo.

Maria Kirilenko of Russia serves to Aleksandra Wozniak of Canada during their women's singles match at the Australian Open. – Reuters Photo.