No. 2 Roger Federer is undefeated in night matches, and wasn't about to be stopped at the U.S. Open -- but for a while there in the second set, anyone watching might have thought differently. After a largely uneventful first set, Melzer settled into a rapid-fire, cerebral groove, taking Federer to a second-set tiebreaker (the highlight of which was the removal of a very large moth from the court). With a little luck and a crucial shot that grazed the net at a crucial time, Federer prevailed, and closed out the match to win 6-3, 7-6 (7-4), 6-3.
Asked in the post-match interview about Melzer's extremely energetic play, which lasted right up through match point, Federer laughed, "I don't have four legs." (Well, Djokovic has three.)
Federer will face Robin Söderling in the quarterfinals.
For more U.S. Open coverage, visit SB Nation's Daily Forehand.