Del Potro at U.S. Open

Del Potro at U.S. Open

NEW YORK, United States - Argentina's Juan Martin Del Potro plays a shot in his first round men's singles match against France's Florent Serra at the U.S. Open championship in New York on Aug. 29, 2012. Del Potro advanced to the second round.

Nishikori reaches 3rd round at Wimbledon

Nishikori reaches 3rd round at Wimbledon

LONDON, Britain - Japan's Kei Nishikori plays Frenchman Florent Serra in a men's singles second-round match at the Wimbledon Championships at the All England Club in London on June 28, 2012. Nishikori advanced to the third round with a 6-3, 7-5, 6-2 victory.

Nishikori reaches 3rd round at Wimbledon

Nishikori reaches 3rd round at Wimbledon

LONDON, Britain - Japan's Kei Nishikori acknowledges the crowd after overpowering Frenchman Florent Serra in straight sets in a men's singles second-round match at the Wimbledon Championships at the All England Club in London on June 28, 2012. Nishikori advanced to the third round with a 6-3, 7-5, 6-2 victory.

Nishikori reaches 3rd round at Wimbledon

Nishikori reaches 3rd round at Wimbledon

LONDON, Britain - Japan's Kei Nishikori celebrates after overpowering Frenchman Florent Serra in straight sets in a men's singles second-round match at the Wimbledon Championships at the All England Club in London on June 28, 2012. Nishikori advanced to the third round with a 6-3, 7-5, 6-2 victory.

Nishikori reaches 3rd round at Wimbledon

Nishikori reaches 3rd round at Wimbledon

LONDON, Britain - Japan's Kei Nishikori plays Frenchman Florent Serra in a men's singles second-round match at the Wimbledon Championships at the All England Club in London on June 28, 2012. Nishikori advanced to the third round with a 6-3, 7-5, 6-2 victory.

Nishikori reaches 3rd round at Wimbledon

Nishikori reaches 3rd round at Wimbledon

LONDON, Britain - Japan's Kei Nishikori plays Frenchman Florent Serra in a men's singles second-round match at the Wimbledon Championships at the All England Club in London on June 28, 2012. Nishikori advanced to the third round with a 6-3, 7-5, 6-2 victory.