Tennis

Rafael Nadal of Spain returns the ball to Teymuraz Gabashvili of Russia during the Monte Carlo Masters in Monaco April 16, 2014.

Eric Gaillard/Reuters

Rafael Nadal of Spain returns the ball to Teymuraz Gabashvili of Russia during the Monte Carlo Masters in Monaco

A supporter of the Czech Republic cheers during the quarterfinal of Davis Cup World Group tennis at Ariake Colosseum in Tokyo.

Shizuo Kambayashi/AP

A Czech Republic supporter cheers during the quarter-final of Davis Cup World Group tennis at Ariake Colosseum in Tokyo.

Rafael Nadal of Spain hits a return to Roger Federer of Switzerland during their men's singles semi-final match at the Australian Open 2014 tennis tournament in Melbourne

David Gray/Reuters

Multiple exposure of Rafael Nadal hitting a return to Roger Federer during their men’s singles semi-final match at the Australian Open 2014 in Melbourne on Friday. Nadal won in three sets to go through to the final.

Grigor Dimitrov of Bulgaria is silhouetted as he plays Rafael Nadal of Spain during their quarterfinal at the Australian Open tennis championship in Melbourne, Australia, Wednesday, Jan. 22, 2014.

Aijaz Rahi/AP

Grigor Dimitrov of Bulgaria is silhouetted as he plays Rafael Nadal of Spain during their quarter final at the Australian Open tennis championship in Melbourne, AustraliaRead more

Serena Williams of the U.S. serves to Daniela Hantuchova of Slovakia during their women's singles match at the Australian Open 2014 tennis tournament in Melbourne...Serena Williams of the U.S. serves to Daniela Hantuchova of Slovakia during their women's singles match at the Australian Open 2014 tennis tournament in Melbourne January 17, 2014.

Jason Reed/Reuters

Serena Williams of the US serves to Daniela Hantuchova of Slovakia during their women’s singles match at the Australian Open 2014 tennis tournament in Melbourne. Williams won 6-3 6-3. Read more

Tennis fans protect themselves from the sun during a first round match at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Jan. 14, 2014.

Aaron Favila/AP

Tennis fans protect themselves from the sun during a first round match at the Australian Open tennis championship in Melbourne, AustraliaRead more

Novak Djokovic of Serbia signs autographs after his men's singles match against Lukas Lacko of Slovakia at the Australian Open 2014 tennis tournament in Melbourne

David Gray/Reuters

Novak Djokovic of Serbia signs autographs after his men’s singles match against Lukas Lacko of Slovakia at the Australian Open 2014 tennis tournament in Melbourne. Djokovic won 6-3 7-6 (7-2) 6-1.

Blue-tipped fingernails of Williams of the U.S. are seen as she bounces the ball to serve during her women's singles match against Makarova of Russia at the Australian Open 2014 tennis tournament in Melbourne...The blue-tipped fingernails of Venus Williams of the U.S. are seen as she bounces the ball to serve during her women's singles match against Ekaterina Makarova of Russia at the Australian Open 2014 tennis tournament in Melbourne January 13, 2014. REUTERS/Jason Reed

Jason Reed/Reuters

Venus Williams of the US prepares to serve against Ekaterina Makarova of Russia at the Australian Open in Melbourne. Read more

Williams of the U.S. serves to Cibulkova of Slovakia during their women's singles match at the Brisbane International tennis tournament in Brisbane...Serena Williams of the U.S. serves to Dominika Cibulkova of Slovakia during their women's singles match at the Brisbane International tennis tournament in Brisbane, January 2, 2014. REUTERS/Jason Reed

Jason Reed/Reuters

Serena Williams of the US serves to Dominika Cibulková of Slovakia during their women’s singles match at the Brisbane International tennis tournament. Read more

Stephens of U.S. serves during her match against Wozniacki of Denmark at China Open tennis tournament in Beijing...Sloane Stephens of the U.S. serves during her match against Caroline Wozniacki of Denmark at the China Open tennis tournament in Beijing October 3, 2013.  REUTERS/Petar Kujundzic

Petar Kujundzic/Reuters

Sloane Stephens of the US serves during her match against Caroline Wozniacki of Denmark at the China Open tennis tournament in Beijing.