Andy Roddick makes US Open his swan song

"I had no pressure," Klizan said. "If I lose, then I lose. I lose with (a) good player. But I won and I'm very happy. It means for me more that I beat finally a guy from top 10."

This year's Open has generated plenty of drama in one area: comebacks from two sets down. American Mardy Fish rallied to beat Nikolay Davydenko 4-6, 6-7 (4), 6-2, 6-1, 6-2, the 10th time in this tournament a man has won after losing the first two sets — already an Open record.

The 30-year-old Fish, seeded 23rd, missed two months this season because of an accelerated heartbeat but showed few signs of fatigue in playing nearly 3 1/2 hours.

Davydenko had an interesting take on the match, suggesting men should only play best-of-three sets, rather than five.

"Why (do) girls play best of three sets and we should play best of five sets and have the same prize money?" Davydenko said, reviving a familiar debate.

"Why are we playing five-set matches? We need to play best of three in Grand Slams. Everybody will support (that idea, even Roger) Federer. For Federer, it's easy to win in one hour, two sets. No need to run (for) a third set," Davydenko said.

Tomas Berdych, the sixth seed, had a similarly easy time to Federer, beating Jurgen Zopp of Estonia, 6-1, 6-4, 6-2.

And after Tsonga lost, another top-five seed was at least pushed beyond a straight-sets finish. Second-seeded Agnieszka Radwanska was down a set and a break to 39th-ranked Carla Suarez Navarro. Then she won 11 straight games for a 4-6, 6-3, 6-0 victory.

A week before the start of the Open, Ana Ivanovic couldn't walk without pain in her right foot.

"That's when I started to panic a little bit," she said.

Two matches into the tournament, the 2008 French Open champion is feeling healthy — and relaxed. The 12th-seeded Ivanovic and another Serbian former top-ranked player, Jelena Jankovic, have quietly reached the third round at Flushing Meadows. Each has dropped just nine games through a pair straight-set wins.

Ivanovic beat 51st-ranked Sofia Arvidsson of Sweden 6-2, 6-2 on Thursday. Jankovic, seeded 30th, defeated 115th-ranked Lara Arruabarrena-Vecino of Spain 6-4, 6-2.

Asked if the torn tendon is fully healed, Ivanovic laughed and said, "I still have a handful of pills every morning."

But the foot hasn't been hurting since the tournament started, and Ivanovic's draw is looking fairly painless with Caroline Wozniacki and Francesca Schiavone eliminated in her quarter.

Ivanovic has been trying to regain her health and her confidence for the last four years. She has yet to make it back to even a quarterfinal of a Grand Slam event.

"I'm really motivated. I want to get back to the top and back in contention to win Grand Slams again," Ivanovic said. "It's been a long process of getting my mind there and my body and game and everything together. Still, it's going to be a lot of hard work and long process, but I'm starting to enjoy it as well.

"I know if it doesn't happen this week, it's coming."

In other women's second-round action Thursday, 13th-seeded Dominika Cibulkova and No. 14 Maria Kirilenko advanced in straight sets.

Kei Nishikori, seeded 17th on the men's side, eliminated American Tim Smyczek.

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