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Serena Williams

Serena Williams of the United States of America tosses her racquet in her fourth round match against Ekaterina Makarova of Russia during day eight of the 2012 Australian Open at Melbourne Park on January 23, 2012 in Melbourne, Australia.

Ekaterina Makarova

Ekaterina Makarova of Russia celebrates winning her fourth round match against Serena Williams of the United States of America during day eight of the 2012 Australian Open at Melbourne Park on January 23, 2012 in Melbourne, Australia.

Andy Murray

Andy Murray of Great Britain serves in his fourth round match against Mikhail Kukushkin of Kazakhstan during day eight of the 2012 Australian Open at Melbourne Park on January 23, 2012 in Melbourne, Australia.

Ana Ivanovic

Ana Ivanovic of Serbia reacts in her fourth round match against Petra Kvitova of the Czech Republic during day eight of the 2012 Australian Open at Melbourne Park on January 23, 2012 in Melbourne, Australia.

Petra Kvitova

Petra Kvitova of the Czech Republic plays a backhand in her fourth round match against Ana Ivanovic of Serbia during day eight of the 2012 Australian Open at Melbourne Park on January 23, 2012 in Melbourne, Australia.

Novak Djokovic

Novak Djokovic of Serbia plays a forehand in his fourth round match against Lleyton Hewitt of Australia during day eight of the 2012 Australian Open at Melbourne Park on January 23, 2012 in Melbourne, Australia.

Lleyton Hewitt

Lleyton Hewitt of Australia lays on the court in his fourth round match against Novak Djokovic of Serbia during day eight of the 2012 Australian Open at Melbourne Park on January 23, 2012 in Melbourne, Australia.

Bec Hewitt

Bec Hewitt, watches her husband Lleyton Hewitt of Australia in his fourth round match against Novak Djokovic of Serbia during day eight of the 2012 Australian Open at Melbourne Park on January 23, 2012 in Melbourne, Australia.

Kei Nishikori

Kei Nishikori of Japan plays a backhand in his fourth round match against Jo-Wilfried Tsonga of France during day eight of the 2012 Australian Open at Melbourne Park on January 23, 2012 in Melbourne, Australia.

Novak Djokovic v Lleyton Hewitt

Novak Djokovic of Serbia (L) shakes hands after victory in his men's singles match against Lleyton Hewitt of Australia on the eighth day of the Australian Open tennis tournament in Melbourne early January 24, 2012. Djokovic won 6-1. 6-3. 4-6. 6-3.

Novak Djokovic

Novak Djokovic of Serbia steadies himself on court during his men's singles match against Lleyton Hewitt of Australia on the eighth day of the Australian Open tennis tournament in Melbourne on January 23, 2012.

Lleyton Hewitt

Lleyton Hewitt of Australia celebrates winning a point during his men's singles match against Novak Djokovic of Serbia on the eighth day of the Australian Open tennis tournament in Melbourne on January 23, 2012.

Jelena Ristic

Jelena Ristic, girlfriend of Novak Djokovic of Serbia watches his interview after he won his fourth round match against Lleyton Hewitt of Australia during day eight of the 2012 Australian Open at Melbourne Park on January 23, 2012 in Melbourne, Australia.