Tennis

Mayor of London Boris Johnson joins  some of world's best wheelchair tennis players outside City Hall in London, as they demonstrate their skills ahead of the forthcoming NEC Wheelchair Tennis Masters in Birmingham. PRESS ASSOCIATION Photo. Picture date: Monday November 24, 2014.

Steve Parsons/PA

Mayor of London Boris Johnson joins some of world’s best wheelchair tennis players outside City Hall in London, as they demonstrate their skills ahead of the forthcoming NEC Wheelchair Tennis Masters in Birmingham

Nadal of Spain returns a shot to Gasquet of France during their men's singles match at the China Open tennis tournament in Beijing

Petar Kujundzic/Reuters

Rafael Nadal of Spain returns a shot to Richard Gasquet of France during their men’s singles match at the China Open tennis tournament in Beijing on Tuesday

Serena Williams of the U.S. serves during her women's singles match against Silvia Soler-Espinosa of Spain at the China Open tennis tournament in Beijing...Serena Williams of the U.S. serves during her women's singles match against Silvia Soler-Espinosa of Spain at the China Open tennis tournament in Beijing September 29, 2014.

Petar Kujundzic/Reuters

Serena Williams of the US serves during her singles match against Spain’s Silvia Soler-Espinosa at the China Open tennis tournament in Beijing on Monday.

A fan yawns as he watches the match between Kei Nishikori, of Japan, and Milos Raonic, of Canada, during the fourth round of the 2014 U.S. Open tennis tournament Tuesday, Sept. 2, 2014, in New York. (AP Photo/Darron Cummings)

Darron Cummings/AP

A fan yawns as he watches the match between Kei Nishikori, of Japan, and Milos Raonic, of Canada, during the fourth round of the 2014 U.S. Open tennis tournament on Tuesday. 

Fans on Murray Mount enjoy the sun as they watch the action on a big screen during day eleven of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon. PRESS ASSOCIATION Photo. Picture date: Thursday July 3, 2014.

Jonathan Brady/PA

Fans on Murray Mount enjoy the sun as they watch the action on a big screen during day eleven of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon

Great Britain's Andy Murray celebrates a point against Bulgaria's Grigor Dimitrov during day ten of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon. PRESS ASSOCIATION Photo. Picture date: Wednesday July 2, 2014.

John Walton/PA

Great Britain’s Andy Murray celebrates a point against Grigor Dimitrov of Bulgaria during their quarter-final match in the Wimbledon Championships. Murray went on to lose in straight sets

Roger Federer of Switzerland serves during his men's singles tennis match against Tommy Robredo of Spain at the Wimbledon Tennis Championships, in London...Roger Federer of Switzerland serves during his men's singles tennis match against Tommy Robredo of Spain at the Wimbledon Tennis Championships, in London July 1, 2014.    REUTERS/Toby Melville (BRITAIN  - Tags: SPORT TENNIS)

Toby Melville/Reuters

Roger Federer of Switzerland serves during his men’s singles tennis match against Tommy Robredo of Spain at the Wimbledon Tennis Championships on Tuesday, which he won in three sets 

Spectators take cover from the rain at the Wimbledon Tennis Championships, in London June 30, 2014.

Max Rossi/Reuters

Spectators take cover from the rain at the Wimbledon Tennis Championships in London

Tennis - 2014 Wimbledon Championships - Day Three - The All England Lawn Tennis and Croquet Club...Andy Murray playing Blaz Rola on day three of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon. PRESS ASSOCIATION Photo. Picture date: Wednesday June 25, 2014. See PA story TENNIS Wimbledon. Photo credit should read: Philip Toscano/PA Wire. RESTRICTIONS: Editorial use only. No video emulation. No false commercial association. No manipulation of images. No use with any unofficial third party logos. No transmission of images to mobile services.

Philip Toscano/PA

Andy Murray playing Blaz Rola on day three of the Wimbledon Championships at the All England Lawn Tennis and Croquet Club, Wimbledon

Rafael Nadal of Spain reacts after defeating Martin Klizan of Slovaki in their men's singles tennis match at the Wimbledon Tennis Championships, in London...Rafael Nadal of Spain reacts after defeating Martin Klizan of Slovaki in their men's singles tennis match at the Wimbledon Tennis Championships, in London June 24, 2014.

Suzanne Plunkett/Reuters

Rafael Nadal of Spain reacts after defeating Martin Klizan of Slovaki in their men’s singles tennis match at the Wimbledon Tennis Championships, in London