Maria Sharapova of Russia hits a backhand during her Women's Singles Second Round match against Nadia Petrova of Russia on day four of the French Open at Roland Garros on May 27, 2009 in Paris, France

Serena Williams of the United States of America reacts after a point in her women\'s final match against Justine Henin of Belgium during day thirteen of the 2010 Australian Open

Elena Dementieva of Russia plays a backhand in her match against Shahar Peer of Israel during day four of the ASB Classic at ASB Tennis Centre on January 7, 2009 in Auckland, New Zealand

Ana Ivanovic of Serbia stretches to hit a backhand during her Ladies' Singles First Round match against Sara Errani of Italy at the French Open on May 24, 2009 in Paris, France

Fernando Verdasco of Spain looks on between games in his fourth round match against Nikolay Davydenko of Russia during day eight of the 2010 Australian Open

Roger Federer of Switzerland shakes hands with Novak Djokovic of Serbia after their men's semifinal during the Sony Ericsson Open at the Crandon Park Tennis Center on April 3, 2009 in Key Biscayne, Florida