U.S. Open tennis

U.S. Open tennis

NEW YORK, United States - Andy Murray of Britain plays against Florian Mayer of Germany in a men's third round match at the U.S. Open tennis tournament in New York on Sept. 1, 2013. Murray won 7-6(2), 6-2, 6-2.

U.S. Open tennis

U.S. Open tennis

NEW YORK, United States - Andy Murray of Britain plays against Florian Mayer of Germany in a men's third round match at the U.S. Open tennis tournament in New York on Sept. 1, 2013. Murray won 7-6(2), 6-2, 6-2.

Wimbledon tennis 1st round

Wimbledon tennis 1st round

LONDON, United Kingdom - Novak Djokovic of Serbia returns a shot during a first-round men's singles match at the Wimbledon Championships against Germany's Florian Mayer at the All England Club in Wimbledon, southwest London, on June 25, 2013. Djokovic won 6-3, 7-5, 6-4.

Wimbledon tennis 1st round

Wimbledon tennis 1st round

LONDON, United Kingdom - Novak Djokovic of Serbia returns a shot during a first-round men's singles match at the Wimbledon Championships against Germany's Florian Mayer at the All England Club in Wimbledon, southwest London, on June 25, 2013. Djokovic won 6-3, 7-5, 6-4.

Djokovic advances to semifinals at Wimbledon

Djokovic advances to semifinals at Wimbledon

LONDON, Britain - Novak Djokovic of Serbia plays against Florian Mayer of Germany in a men's singles quarterfinals match at the Wimbledon Championships at the All England Club in London on July 4, 2012. Djokovic, who won 6-4, 6-1, 6-4, advanced to the semifinals against Roger Federer of Switzerland.

Djokovic advances to semifinals at Wimbledon

Djokovic advances to semifinals at Wimbledon

LONDON, Britain - Novak Djokovic of Serbia celebrates after beating Florian Mayer of Germany in a men's singles quarterfinals match at the Wimbledon Championships at the All England Club in London on July 4, 2012. Djokovic, who won 6-4, 6-1, 6-4, advanced to the semifinals against Roger Federer of Switzerland.

Djokovic advances to semifinals at Wimbledon

Djokovic advances to semifinals at Wimbledon

LONDON, Britain - Novak Djokovic of Serbia plays against Florian Mayer of Germany in a men's singles quarterfinals match at the Wimbledon Championships at the All England Club in London on July 4, 2012. Djokovic, who won 6-4, 6-1, 6-4, advanced to the semifinals against Roger Federer of Switzerland.

Djokovic advances to semifinals at Wimbledon

Djokovic advances to semifinals at Wimbledon

LONDON, Britain - Florian Mayer of Germany plays against Novak Djokovic of Serbia in a men's singles quarterfinals match at the Wimbledon Championships at the All England Club in London on July 4, 2012. Djokovic, who won 6-4, 6-1, 6-4, advanced to the semifinals against Roger Federer of Switzerland.

Nishikori pulls out of Gerry Weber tournament again

Nishikori pulls out of Gerry Weber tournament again

World No. 6 Kei Nishikori holds a press conference in Halle, Germany, on June 15, 2016, to announce his withdrawal from the Gerry Weber Open tennis tournament for the second straight year. Earlier that day, the Japanese forfeited his second-round match against Germany's Florian Mayer due to an injury to his oblique muscles. (Kyodo) ==Kyodo

Tennis: Nadal breezes into Australian Open 2nd round

Tennis: Nadal breezes into Australian Open 2nd round

Rafael Nadal plays Florian Mayer of Germany in the first round of the Australian Open in Melbourne on Jan. 17, 2017. Nadal won 6-3, 6-4, 6-4. (Kyodo) ==Kyodo