Ana Ivanovic of Serbia returns a shot to Roberta Vinci of Italy during day four of the Brisbane International 2009 at the State Tennis Centre on January 7, 2009 in Brisbane, Australia

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

British player Andy Murray serves to Argentinian player Juan Ignacio Chela during their French Open tennis first round match on May 24, 2009 at Roland Garros stadium in Paris.

Alla Kudryavtseva of Russia plays a forehand in her match against Nicole Vadisova of the Czech Republic during day one of the ASB Classic at ASB Tennis Centre on January 5, 2009 in Auckland, New Zealand

Juan Martin Del Potro of Argentina celebrates winning a point in his second round match against Florian Mayer of Germany during day three of the 2009 Australian Open at Melbourne Park on January 21, 2009

Juan Monaco of Argentina returns a shot against Andy Murray of Great Britain during day six of the Sony Ericsson Open at the Crandon Park Tennis Center on March 28, 2009 in Key Biscayne, Florida