Fifth-seeded Nikolay Davydenko rallied from two sets and a break down to reach the men's quarterfinals and snap Dominik Hrbaty's run of five-set wins with a 4-6, 4-6, 6-4, 6-2, 6-3 victory.
After his loss on Monday, Hrbaty had spent a total of 13 hours and 57 minutes on court in four matches. The No. 12 seed from Slovakia was only the fourth man to play four consecutive five-set matches at one Grand Slam tournament.
American Robby Ginepri was the most recent, winning three times in five-setters at last year's US Open before losing the semifinal in five to Andre Agassi.
No. 21 Nicolas Kiefer had a 7-6 (4), 6-3, 6-3 win over Juan Ignacio Chela, who had ousted third-seeded Lleyton Hewitt in the second round.
Kiefer next plays No. 25 Sebastien Grosjean, a 7-5, 6-2, 6-2 winner over fellow Frenchman Paul-Henri Mathieu.
WTA Championship winner Amelie Mauresmo cruised into the quarterfinals, committing only two unforced errors in a 6-1, 6-1 victory over 16-year-old Nicole Vaidisova.
Mauresmo next plays Switzerland's Patty Schnyder, who beat 2004 French Open champion Anastasia Myskina 6-2, 6-1 in 55 minutes.
Myskina struggled with her groundstrokes and had 32 unforced errors against only 13 for seventh-seeded Schnyder.
While Vaidisova was seeded 16th and dictated the pace of the match, the young Czech showed her inexperience on center court with 34 unforced errors to 14 winners and had her serve broken five times. Mauresmo won nearly twice as many points, 51-27.
Top-ranked Roger Federer, the overwhelming favorite in the men's draw, was playing Tommy Haas in the last match of the night.
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