Roger Federer rallied on Saturday for a 6-7 (4), 6-2, 6-4, 6-2 triumph over John Isner to reach the fourth round.
2 of 12Chuck Solomon/SI
Isner impressed Federer with his 18 aces, but couldn't overcome the world's number one player.
3 of 12Chuck Solomon/SI
Serena Williams' 6-3, 6-4 victory over Wimbledon runner-up Marion Bartoli set up a quarterfinal match with No. 1 Justine Henin. It'll be the third consecutive major she's played Henin in the quarterfinals, having lost to her at the French Open and Wimbledon.
4 of 12Jessica Kluetmeier/SI
Another all-Williams showdown could materialize at Flushing Meadows. On Sunday Venus beat French Open runner-up Ana Ivanovic 6-4, 6-2, and moved into a quarterfinal against No. 3 Jelena Jankovic.
5 of 12Jessica Kluetmeier/SI
Serbian teenager Ana Ivanovic was steamrolled by Venus Williams on Sunday night in the fourth round of the U.S. Open.
6 of 12Jessica Kluetmeier/SI
Still struggling with left knee pain, No. 2 seed Rafael Nadal advanced past Jo-Wilfried Tsonga in the third round on Sunday.
7 of 12Jessica Kluetmeier/SI
The top-seeded Justine Henin easily defeated 15th-seeded Russian Dinara Safina 6-0, 6-2 in just 59 minutes to advance to the quarterfinals.
8 of 12Manny Millan/SI
Andy Roddick dismantled former Australian Open champ Thomas Johansson of Sweden 6-3, 6-2, 6-0 on Saturday, then defeated Tomas Berdych 7-6 (8-6), 2-0, after the ninth-seeded Czech retired in the second set due to an apparent breathing problem.
9 of 12Chuck Solomon/SI
Reigning champion Maria Sharapova was a stunning third-round loser Saturday, as rising Polish star Agnieszka Radwanska dismissed the second-seeded Russian superstar, who wound up with 49 unforced errors, in three sets.
10 of 12Chuck Solomon/SI
The 30th-seeded Agnieszka Radwanska posted a 6-4, 1-6, 6-2 upset over the former world No. 1 and two-time major titlist Sharapova. The 18-year-old Radwanska won the last six games of the match after losing the previous eight.
11 of 12Manny Millan/SI
Novak Djokovic needed a whopping 4 hours, 44 minutes to stave off the former top-10 performer Stepanek 6-7 (4-7), 7-6 (7-5), 5-7, 7-5, 7-6 (7-2) on Friday. Third-seeded Serbian Djokovic then stormed into the fourth round on Sunday by sweeping past Juan Martin Del Portro of Argentina 6-1, 6-3, 6-4.
12 of 12Chuck Solomon/SI
Eighth-seeded Spaniard Tommy Robredo outlasted American Mardy Fish 6-4, 3-6, 6-4, 6-7 (7-9), 6-4 on Friday, only to lose in straight sets to 19-year old Latvian Ernests Gulbis, ranked No. 139, on Sunday.
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