Australian Open: Women stars turn it on

Poland's Agnieszka Radwanska plays a return during her women's singles match against Heather Watson of Britain on the fifth day of the Australian Open tennis tournament in Melbourne on January 18, 2013.  (AFP)

France's Marion Bartoli reacts after a point against Russia's Ekaterina Makarova during their women's singles match on day five of the Australian Open tennis tournament in Melbourne on January 18, 2013. (AFP)

China's Li Na serves against Romania's Sorana Cirstea during their women's singles match on day five of the Australian Open tennis tournament in Melbourne on January 18, 2013. (AFP)

Serbia's Ana Ivanovic serves during her women's singles match against Serbia's Jelena Jankovic on the fifth day of the Australian Open tennis tournament in Melbourne on January 18, 2013. (AFP)

Valeria Savinykh of Russia gestures as she celebrates winning a point during her women's singles match against Kirsten Flipkins of Belgium on the fifth day of the Australian Open tennis tournament in Melbourne on January 18, 2013. (AFP)

Heather Watson of Great Britain plays a backhand in her third round match against Agnieszka Radwanska of Poland during day five of the 2013 Australian Open at Melbourne Park on January 18, 2013 in Melbourne, Australia.  (Getty Images)

Venus Williams of the United States plays a forehand in her third round match against Maria Sharapova of Russia during day five of the 2013 Australian Open at Melbourne Park on January 18, 2013 in Melbourne, Australia.  (Getty Images)

Maria Sharapova of Russia plays a backhand in her third round match against Venus Williams of the United States during day five of the 2013 Australian Open at Melbourne Park on January 18, 2013 in Melbourne, Australia.  (Getty Images)

Jamie Hampton of the United States shows her emotions in her third round match against Victoria Azarenka of Belarus during day six of the 2013 Australian Open at Melbourne Park on January 19, 2013 in Melbourne, Australia.  (Getty Images)

Yanina Wickmayer of Belarus plays a forehand in her third round match against Maria Kirilenko of Russia during day six of the 2013 Australian Open at Melbourne Park on January 19, 2013 in Melbourne, Australia.  (Getty Images)

Victoria Azarenka of Belarus plays a forehand in her third round match against Jamie Hampton of the United States during day six of the 2013 Australian Open at Melbourne Park on January 19, 2013 in Melbourne, Australia.  (Getty Images)

Maria Kirilenko of Russia plays a forehand in her third round match against Yanina Wickmayer of Belgium during day six of the 2013 Australian Open at Melbourne Park on January 19, 2013 in Melbourne, Australia.  (Getty Images)

Harriet Dart of Great Britain plays a forehand in her first round match against Annett Kontaveit of Estonia during the 2013 Australian Open Junior Championships at Melbourne Park on January 19, 2013 in Melbourne, Australia.  (Getty Images)

Elena Vesnina of Russia plays a forehand in her third round match against Roberta Vinci of Italy during day six of the 2013 Australian Open at Melbourne Park on January 19, 2013 in Melbourne, Australia.  (Getty Images)

Caroline Wozniacki of Denmark plays a backhand in her third round match against Lesia Tsurenko of the Ukraine during day six of the 2013 Australian Open at Melbourne Park on January 19, 2013 in Melbourne, Australia.  (Getty Images)

Caroline Wozniacki of Denmark plays a forehand in her third round match against Lesia Tsurenko of the Ukraine during day six of the 2013 Australian Open at Melbourne Park on January 19, 2013 in Melbourne, Australia.  (Getty Images)

Lesia Tsurenko of the Ukraine plays a backhand in her third round match against Caroline Wozniacki of Denmark during day six of the 2013 Australian Open at Melbourne Park on January 19, 2013 in Melbourne, Australia.  (Getty Images)

Laura Robson of Great Britain plays a forehand in her third round match against Sloane Stephens of the United States during day six of the 2013 Australian Open at Melbourne Park on January 19, 2013 in Melbourne, Australia.  (Getty Images)

Sloane Stephens of the United States looks on in her third round match against Laura Robson of Great Britain during day six of the 2013 Australian Open at Melbourne Park on January 19, 2013 in Melbourne, Australia.  (Getty Images)

Serena Williams of the United States reacts in her third round match against Ayumi Morita of Japan during day six of the 2013 Australian Open at Melbourne Park on January 19, 2013 in Melbourne, Australia.  (Getty Images)

Elizaveta Kulichkova of Russia plays a forehand in her first round match against Illka Csoregi of Romania during the 2013 Australian Open Junior Championships at Melbourne Park on January 20, 2013 in Melbourne, Australia.  (Getty Images)

Katy Dunne of Great Britain plays a forehand in her first round match against Giulia Pairone of Italy during the 2013 Australian Open Junior Championships at Melbourne Park on January 20, 2013 in Melbourne, Australia.  (Getty Images)

Katy Dunne of Great Britain celebrates a point in her first round match against Giulia Pairone of Italy during the 2013 Australian Open Junior Championships at Melbourne Park on January 20, 2013 in Melbourne, Australia.  (Getty Images)

Russia's Ekaterina Makarova, right, walks past her opponent Germany's Angelique Kerber during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013.(AP)

Germany's Angelique Kerber reacts during her fourth round match against Russia's Ekaterina Makarova at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP)

Germany's Angelique Kerber receives treatment from a trainer during her fourth round match against Russia's Ekaterina Makarova at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP)

Russia's Ekaterina Makarova celebrates after defeating Germany's Angelique Kerber in their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP)

Germany's Angelique Kerber waves as she walks from Rod Laver Arena following her fourth round loss to Russia's Ekaterina Makarova at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP)

Germany's Angelique Kerber, right, walks from Rod Laver Arena following her fourth round loss to Russia's Ekaterina Makarova at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP)

Germany's Angelique Kerber, left, congratulates Russia's Ekaterina Makarova following during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 20, 2013. (AP)

Follow Emirates 24|7 on Google News.