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Stanislas Wawrinka of Switzerland signs autographs for fans, after defeating Rafael Nadal of Spain during the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 26, 2014. (AP Photo/Andrew Brownbill) ( Australian Open Tennis )

Switzerland's Stanislas Wawrinka (R) speaks with Spain's Rafael Nadal after his victory during the men's singles final on day 14 of the 2014 Australian Open tennis tournament in Melbourne on January 26, 2014. SAEED KHAN/AFP/Getty Images ( 526414847 )

Switzerland's Stanislas Wawrinka plays a shot against Spain's Rafael Nadal during the men's singles final on day 14 of the 2014 Australian Open tennis tournament in Melbourne on January 26, 2014. SAEED KHAN/AFP/Getty Images ( 526409952 )

Rafael Nadal of Spain makes a backhand return to Stanislas Wawrinka of Switzerland during the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 26, 2014.(AP Photo/Rick Rycroft) ( Australian Open Tennis )

Fans of Stanislas Wawrinka of Switzerland watch in his men's final match against Rafael Nadal of Spain during day 14 of the 2014 Australian Open at Melbourne Park on January 26, 2014 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images) ( 465132369 )

Stanislas Wawrinka of Switzerland hits a return against Rafael Nadal of Spain in the men's singles final on day 14 of the 2014 Australian Open tennis tournament in Melbourne on January 26, 2014. PAUL CROCK/AFP/Getty Images ( 526410905 )

Rafael Nadal of Spain walks back onto court after leaving for medical reasons during his match against Stanislas Wawrinka of Switzerland in the men's final at the Australian Open tennis tournament in Melbourne, Australia, 26 January 2014. EPA/MARK DADSWELL ( AUSTRALIA TENNIS AUSTRALIAN OPEN GRAND SLAM )

Switzerland's Stanislas Wawrinka reacts after a point against Spain's Rafael Nadal during the men's singles final on day 14 of the 2014 Australian Open tennis tournament in Melbourne on January 26, 2014. SAEED KHAN/AFP/Getty Images ( 526409982 )

Fans of Stanislas Wawrinka of Switzerland cheer him on as he plays against Rafael Nadal of Spain in the men's singles final on day 14 of the 2014 Australian Open tennis tournament in Melbourne on January 26, 2014. PAUL CROCK/AFP/Getty Images ( 526415018 )

Spain's Rafael Nadal serves against Switzerland's Stanislas Wawrinka during the men's singles final on day 14 of the 2014 Australian Open tennis tournament in Melbourne on January 26, 2014. SAEED KHAN/AFP/Getty Images ( 526410273 )

Rafael Nadal of Spain plays a backhand in his his men's final match against Stanislas Wawrinka of Switzerland during day 14 of the 2014 Australian Open at Melbourne Park on January 26, 2014 in Melbourne, Australia. (Photo by Matt King/Getty Images) ( 465127087 )

Spain's Rafael Nadal reacts after a point against Switzerland's Stanislas Wawrinka during the men's singles final on day 14 of the 2014 Australian Open tennis tournament in Melbourne on January 26, 2014. SAEED KHAN/AFP/Getty Images ( 526415159 )

Stanislas Wawrinka of Switzerland, left, talks with tournament referee Wayne McKewen as Rafael Nadal of Spain takes an injury time out in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 26, 2014. (AP Photo/Andrew Brownbill) ( Australian Open Tennis )

Rafael Nadal of Spain plays a backhand in his men's final match against Stanislas Wawrinka of Switzerland during day 14 of the 2014 Australian Open at Melbourne Park on January 26, 2014 in Melbourne, Australia. (Photo by Clive Brunskill/Getty Images) ( 465132091 )

Stanislas Wawrinka of Switzerland plays a backhand in his men's final match against Rafael Nadal of Spain during day 14 of the 2014 Australian Open at Melbourne Park on January 26, 2014 in Melbourne, Australia. (Photo by Matt King/Getty Images) ( 465133019 )

Rafael Nadal of Spain during his match against Stanislas Wawrinka of Switzerland in the men's final at the Australian Open tennis tournament in Melbourne, Australia, 26 January 2014. EPA/DAVID CROSLING ( AUSTRALIA TENNIS AUSTRALIAN OPEN GRAND SLAM )

Spain's Rafael Nadal reacts after a point against Switzerland's Stanislas Wawrinka during the men's singles final on day 14 of the 2014 Australian Open tennis tournament in Melbourne on January 26, 2014. SAEED KHAN/AFP/Getty Images ( 526415095 )

Stanislas Wawrinka of Switzerland celebrates a point in his men's final match against Rafael Nadal of Spain during day 14 of the 2014 Australian Open at Melbourne Park on January 26, 2014 in Melbourne, Australia. (Photo by Mark Kolbe/Getty Images) ( 465142115 )

Rafael Nadal of Spain grimaces as he receives medical treatment during his men's final match against Stanislas Wawrinka of Switzerland at the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 26 January 2014. EPA/MADE NAGI ( epaselect AUSTRALIA TENNIS AUSTRALIAN OPEN GRAND SL AM )

Stanislas Wawrinka of Switzerland in action during his men's final match against Rafael Nadal of Spain at the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 26 January 2014. EPA/MADE NAGI ( epaselect AUSTRALIA TENNIS AUSTRALIAN OPEN GRAND SL AM )

Rafael Nadal of Spain throws a ball during his men's final match against Stanislas Wawrinka of Switzerland at the Australian Open Grand Slam tennis tournament in Melbourne, Australia, 26 January 2014. EPA/NARENDRA SHRESTHA ( AUSTRALIA TENNIS AUSTRALIAN OPEN GRAND SLAM )

A fan of Rafal Nadal of Spain paints her face ahead of the final match against Stanislas Wawrinka in Australian Open Grand Slam tennis tournament in Melbourne, Australia, 26 January 2014. EPA/NARENDRA SHRESTHA ( AUSTRALIA TENNIS AUSTRALIAN OPEN GRAND SLAM )

Rafael Nadal of Spain plays a backhand in his men's final match against Stanislas Wawrinka of Switzerland during day 14 of the 2014 Australian Open at Melbourne Park on January 26, 2014 in Melbourne, Australia. (Photo by Quinn Rooney/Getty Images) ( 465127119 )

Spain's Rafael Nadal reacts during his mens singles final match against Switzerland's Stanislas Wawrinka on day fourteen of the 2014 Australian Open tennis tournament in Melbourne on January 26, 2014. GREG WOOD/AFP/Getty Images ( 526415053 )

Stanislas Wawrinka of Switzerland holds up the trophy after defeating Rafael Nadal of Spain during the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 26, 2014.(AP Photo/Aaron Favila) ( Australian Open Tennis )

Stanislas Wawrinka of Switzerland holds the trophy after defeating Rafael Nadal of Spain in the men's singles final at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 26, 2014.(AP Photo/Eugene Hoshiko) ( APTOPIX Australian Open Tennis )

Spain's Rafael Nadal (L) and Switzerland's Stanislas Wawrinka pose for photographs before the men's singles final on day 14 of the 2014 Australian Open tennis tournament in Melbourne on January 26, 2014. SAEED KHAN/AFP/Getty Images ( 526409455 )