Oudin's run ends quietly as Federer marches on

The dazzling US Open run by American teenager Melanie Oudin ended abruptly on Wednesday in a hail of unforced errors, while Roger Federer marched into his 22nd consecutive grand slam semi-final.

Ninth-seeded Dane Caroline Wozniacki was steady, if unspectacular, in defeating the unseeded Oudin 6-2 6-2 to reach the semi-finals of the year's final grand slam.

"I've had a great run this tournament," said the 17-year-old Oudin.

"I'm a perfectionist, so... losing isn't good enough for me. Today I was a little bit fragile."

Top seed Federer overcame an inspired comeback effort by Robin Soderling to beat the 25-year-old Swede 6-0 6-3 6-7 7-6, winning the final-set tiebreaker 8-6.

"It was so close towards the end," said Federer, who has beaten Soderling in all 12 career meetings, including at Wimbledon and the French Open this year.

"It's a great relief to come through. He started to play better and better as the match went on. I knew he was going to be tough but the beginning was a bit too easy. All of a sudden he found his way into the match."

In the semi-finals, the five-times defending champion will face fourth seed Novak Djokovic, who advanced with a 7-6 1-6 7-5 6-2 victory over Spain's Fernando Verdasco, the 10th seed. Elsewhere, Belgium's unseeded Yanina Wickmayer dispatched Ukraine's Kateryna Bondarenko 7-5 6-4 and set up a semi-final encounter with Wozniacki.

But the big news of Day 10 at Flushing Meadows was the quiet elimination of Oudin who failed to respond to the urging of the 23,000 fans at the Arthur Ashe Stadium.

Oudin, who beat fourth seed Elena Dementieva and former champion Maria Sharapova en route to the quarter-finals, had 43 unforced errors during the 88-minute match against Wozniacki and only seven winners from her chief weapon, the forehand.

The 19-year-old Wozniacki kept the pressure on Oudin, registering only five winners, while letting her opponent spray the ball all around the stadium on a blustery night.