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Duval sends champion Stosur packing

Victoria Duval jumps for joy after beating Sam Stosur © AP

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American teenager Victoria Duval provided the upset on the second day of the US Open when she beat 2011 champion Sam Stosur 5-7, 6-4, 6-4, leaping into the air in celebration after converting her fourth match point with a forehand winner.

"I know she didn't play her best today, and this is the best I've played in my career, so I'm really excited," Duval told the Louis Armstrong Stadium crowd. "I just tried to stay in the moment." The 11th-seeded Stosur had reached at least the quarter-finals in her last three trips to the U.S. Open. She had 56 unforced errors.

For all of one game, and only one game, Victoria Azarenka faced a bit of a test in the first round. After needing 10 minutes to break serve at the outset, the second-seeded Azarenka breezed the rest of the way, putting together a 6-0, 6-0 victory over 99th-ranked Dinah Pfizenmaier of Germany. The match was played in Arthur Ashe Stadium, where Azarenka lost in three sets to Serena Williams in last year's final at Flushing Meadows.

This one was far, far less competitive or gripping, except perhaps for the opening game, which lasted 18 points spread over 10 minutes, until two-time Australian Open champion Azarenka converted her sixth break point. The rest of the match took a total of 55 minutes. "There are things, you know, I feel like should be better," Azarenka said. "But overall, it's a good start."

No. 7 seed Petra Kvitova weathered another tough first-round match, needing three sets and nearly two hours to beat 92nd-ranked Misaki Doi. Kvitova won 6-2, 3-6, 6-1 on a windy day at Arthur Ashe Stadium. "I like big matches on the big stadium, but the people … it's too much crowds for myself, I think," she said. Kvitova has reached at least the semi-finals at the other three major events; she has never made it past the fourth round at Flushing Meadows.

Sixth-seeded Caroline Wozniacki held off qualifier Duan Ying-Ying to win her first-round match. With boyfriend Rory McIlroy in the stands, Wozniacki fought off a set point in the second to win 6-2, 7-5. The 133rd-ranked Duan had a chance to serve out the set at 5-3 in her Grand Slam debut, but Wozniacki broke back. Then Duan had a set point on Wozniacki's serve that she couldn't convert. Wozniacki broke serve in the next game, then staved off three break points to clinch the win.

Fourth-seeded Sara Errani posted a "double bagel", routing "lucky loser" Olivia Rogowska 6-0, 6-0 to advance to the second round. Errani, the 2012 French Open runner-up and a semifinalist at Flushing Meadows last year, needed 51 minutes in Armstrong Stadium to dispatch her 151st-ranked opponent, who lost in qualifying but made it into the main draw when Ayumi Morita withdrew with an injury.

No. 13-seeded Ana Ivanovic and 14th-seeded Maria Kirilenko got off to quick starts, each winning in under an hour.

John Isner needed little over an hour to dispatch Filippo Volandri 6-0 6-3 6-2 and book his space in the second round. Milos Raonic enjoyed a straight sets win over Thomas Fabbiano to set up a second round tie with Pablo Andujar.

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