Gael Monfils of France serves against Michael Russell during day five of the Sony Ericsson Open at the Crandon Park Tennis Center on March 27, 2009 in Key Biscayne, Florida

Dinara Safina of Russia reacts while playing against Samantha Stosur of Australia during the third round of the Sony Ericsson Open at the Crandon Park Tennis Center on March 29, 2009 in Key Biscayne, Florida

A detailed view of the net on Rod Laver Arena in the quarterfinal match between Andy Roddick of the United States of America and Marin Cilic of Croatia during day nine of the 2010 Australian Open

Venus Williams of the United States of America prepares to serve in her fourth round match against Francesca Schiavone of Italy during day eight of the 2010 Australian Open

Roger Federer of Switzerland in action against Philipp Kohlschreiber of Germany during the Exxon Mobil Qatar Open Tennis on January 8, 2009 in Doha, Qatar

Mariya Koryttseva of the Ukraine returns a shot against Ana Ivanovic of Serbia during day five of the Sony Ericsson Open at the Crandon Park Tennis Center on March 27, 2009 in Key Biscayne, Florida