Roger Federer of Switzerland reaches for a return during his match against Paul-Henri Mathieu of France at the U.S. Open on Sept. 4, 2010. He won 6-4, 6-3, 6-3.

Novak Djokovic of Serbia serves during his match against James Blake at the U.S. Open. He won in straight sets, 6-1, 7-6 (4), 6-3.

Vera Zvonareva of Russia loses her hat while returning a shot against Alexandra Dulgheru of Romania at the U.S. Open. She won 6-2, 7-6 (2).

Mardy Fish, the last American male still in contention at the U.S. Open, celebrates his 4-6, 6-3, 6-4, 1-6, 6-3 win over Arnaud Clement of France.

Caroline Wozniacki of Denmark returns a shot against Yung-Jan Chan of Taiwan during their U.S. Open match. She won 6-1, 6-0.

Maria Sharapova of Russia focuses on a ball before hitting a return to American teen Beatrice Capra at the U.S. Open. She shut out the 18-year-old, 6-0, 6-0.

Kaia Kanepi of Estonia returns the ball to Jelena Jankovic of Serbia at the U.S. Open. She upset the No. 4 seed 6-2, 7-6 (1).

Robin Soderling of Sweden hits a forehand return to Thiemo de Bakker of the Netherlands during their third-round match at the U.S. Open. The No. 5 seed won 6-2, 6-3, 6-3.