Caroline Wozniacki watches the semi-final match between Andy Murray and David Ferrer

Caroline Wozniacki watches the semi-final match between Andy Murray and David Ferrer

Rafael Nadal reacts during his loss to David Ferrer in their quarter-final men's singles match

Rafael Nadal reacts during his loss to David Ferrer in their quarter-final men's singles match 

Rafael Nadal bangs his racket in frustration

Rafael Nadal bangs his racket in frustration during his quarterfinal against compatriot David Ferrer

Benjamin Plant of Miami Horror performs during the 2011 Australian Open

Benjamin Plant of Miami Horror performs during the 2011 Australian Open

Kim Clijsters holds "Matilda" a baby echidna

Kim Clijsters holds "Matilda" a baby echidna outside the players lounge at the Australian Open tennis championship

Rebecca Judd and husband Chris Judd attend the 2011 Australian Open

Rebecca Judd and husband AFL player Chris Judd arrive for the evening tennis on day five of the 2011 Australian Open at Melbourne Park 

Serena Williams. poses with the champion's trophy

Serena Williams  poses with the champion's trophy..
REUTERS/Tim Wimborne

Marin Cilic serves in his quarterfinal match against Andy Roddick

 Marin Cilic of Croatia serves in his quarterfinal match against Andy Roddick of the United States of America during day nine of the 2010 Australian Open at Melbourne Park

Yanina Wickmayer plays Justine Henin under an evening sky in Rod Laver Arena

Belgium's Yanina Wickmayer plays Justine Henin under an evening sky in Rod Laver Arena at the Australian Open in Melbourne.
Credit: REUTERS/David Gray

Andy Murray throws his racket during his match against John Isner

Andy Murray of Britain throws his racket during his match against John Isner of the U.S. at the Australian Open tennis tournament in Melbourne.  REUTERS/David Gray

Rafael Nadal serves against Philipp Kohlschreiber

Spain's Rafael Nadal serves against Philipp Kohlschreiber of Germany at the Australian Open tennis tournament in Melbourne .
Credit: REUTERS/Vivek Prakash

RafaelNadal of Spain reaches out for a return

Rafael Nadal of Spain reaches out for a return to Germany's Philipp Kohlschreiber during their Men's singles third round match at the Australian Open tennis championship in Melbourne, Australia

Night falls on Margaret Court Arena

Night falls on Margaret Court Arena as Russia's Mikhail Youzhny plays Richard Gasquet of France during the Australian Open tennis tournament in Melbourne. 
Credit: REUTERS/Daniel Munoz

Novak Djokovic reacts during his match against Marco Chiudinelli

Serbia's Novak Djokovic reacts during his match against Marco Chiudinelli of Switzerland at the Australian Open tennis tournament in Melbourne.
Credit: REUTERS/David Gray

Gael Monfils collides with a linesman during his match against Antonio Veic

France's Gael Monfils collides with a linesman during his match against Antonio Veic of Croatia at the Australian Open tennis tournament in Melbourne . 
Credit: REUTERS/Mick Tsikas

Juan Martin del Potro of Argentina returns to James Blake of the U.S

Juan Martin del Potro of Argentina returns to James Blake of the U.S. , during their men's singles match at the Australian Open tennis championship in Melbourne, Australia,