Alexandr Dolgopolov, of Ukraine, tosses his racket during the men's final match against Tommy Haas, of Germany, in the Citi Open tennis tournament on Sunday, Aug. 5, 2012, in Washington. (AP Photo/Nick Wass)

Tommy Haas, of Germany, returns the ball against Alexandr Dolgopolov, of Ukraine, during the men's final match in the Citi Open tennis tournament on Sunday, Aug. 5, 2012, in Washington. (AP Photo/Nick Wass)

Tommy Haas, of Germany, returns the ball against Alexandr Dolgopolov, of Ukraine, during the men's final match in the Citi Open tennis tournament on Sunday, Aug. 5, 2012, in Washington. (AP Photo/Nick Wass)

Alexandr Dolgopolov, of Ukraine, poses with the trophy after he beat Tommy Haas, of Germany, in the men's final match in the Citi Open tennis tournament, Sunday, Aug. 5, 2012, in Washington. Dolgopolov won 6-7(7), 6-4, 6-1. (AP Photo/Nick Wass)

Tommy Haas, right, of Germany, shakes hands with Alexandr Dolgopolov, left, of Ukraine, after the men's final match in the Citi Open tennis tournament, Sunday, Aug. 5, 2012, in Washington. Dolgopolov won 6-7(7), 6-4, 6-1. (AP Photo/Nick Wass)

Tommy Haas, of Germany, complains to the chair umpire during the men's final match in the Citi Open tennis tournament against Alexandr Dolgopolov, of Ukraine, Sunday, Aug. 5, 2012, in Washington. Dolgopolov won 6-7(7), 6-4, 6-1. (AP Photo/Nick Wass)

Alexandr Dolgopolov, of Ukraine, returns the ball against Tommy Haas, of Germany, during the men's final match in the Citi Open tennis tournament, Sunday, Aug. 5, 2012, in Washington. Dolgopolov won 6-7(7), 6-4, 6-1. (AP Photo/Nick Wass)

Alexandr Dolgopolov, of Ukraine, returns the ball against Tommy Haas, of Germany, during the men's final match in the Citi Open tennis tournament, Sunday, Aug. 5, 2012, in Washington. Dolgopolov won 6-7(7), 6-4, 6-1. (AP Photo/Nick Wass)

Alexandr Dolgopolov, of Ukraine, poses with the trophy after he beat Tommy Haas, of Germany, in the men's final match in the Citi Open tennis tournament, Sunday, Aug. 5, 2012, in Washington. Dolgopolov won 6-7(7), 6-4, 6-1. (AP Photo/Nick Wass)

Tommy Haas, of Germany, reaches for the ball against Alexandr Dolgopolov, of Ukraine, during the men's final match in the Citi Open tennis tournament, Sunday, Aug. 5, 2012, in Washington. Dolgopolov won 6-7(7), 6-4, 6-1. (AP Photo/Nick Wass)