Go Soeda, of Japan, returns a shot during a quarterfinal tennis match against Kei Nishikori, also of Japan, at the Atlanta Open, Friday, July 20, 2012, in Atlanta. (AP Photo/John Bazemore)

Kei Nishikori, of Japan, returns a shot to Go Soeda, also of Japan, during a quarterfinal tennis match at the Atlanta Open, Friday, July 20, 2012, in Atlanta. (AP Photo/John Bazemore)

Go Soeda, of Japan, returns a shot during a quarterfinal tennis match against Kei Nishikori, also of Japan, at the Atlanta Open, Friday, July 20, 2012, in Atlanta. (AP Photo/John Bazemore)

Gilles Muller, of Luxembourg, returns a shot during a quarterfinal tennis match against Matthew Ebden, of Australia, at the Atlanta Open, Friday, July 20, 2012 in Atlanta. (AP Photo/John Bazemore)

Gilles Muller, of Luxembourg, returns a shot during a quarterfinal tennis match against Matthew Ebden, of Luxembourg, at the Atlanta Open, Friday, July 20, 2012 in Atlanta. (AP Photo/John Bazemore)

Go Soeda, of Japan, returns a shot during a quarterfinal tennis match against Kei Nishikori, also of Japan, at the Atlanta Open, Friday, July 20, 2012, in Atlanta. (AP Photo/John Bazemore)

Andy Roddick returns a shot during a quarterfinal tennis match against Michael Russell at the Atlanta Open, Friday, July 20, 2012, in Atlanta. (AP Photo/John Bazemore)

Andy Roddick returns a shot during a quarterfinal tennis match against Michael Russell at the Atlanta Open, Friday, July 20, 2012, in Atlanta. (AP Photo/John Bazemore)

Michael Russell returns a shot during a quarterfinal tennis match against Andy Roddick at the Atlanta Open, Friday, July 20, 2012, in Atlanta. (AP Photo/John Bazemore)