...OCTOBER 8: (CHINA OUT) Serena Williams of the US reacts in her third round match against Nadia Petrova of Russia during day seven of the 2009 China Open at the National Tennis Centre on...

BEIJING - OCTOBER 08: Serena Williams of USA returns a shot against Nadia Petrova of Russia in her third round match during day seven of the 2009 China Open at...

Oudin's confidence has grown with each match. Here she celebrates after beating Russia's Nadia Petrova on Monday

NEW YORK - SEPTEMBER 07: Melanie Oudin of the United States returns a shot against Nadia Petrova of Russia during day eight of the 2009 U.S. Open at the USTA Billie Jean...

Oudin Advances

Melanie Oudin reacts during her 1-6, 7-6, 6-3 upset of Nadia Petrova to reach the quarterfinals of the U.S. Open. Also, check out our new ESPN Arcade...

Melanie Oudin of the US reacts against Nadia Petrova from Russia during their 4th round US Open match at the USTA Billie Jean King National...

Melanie Oudin of the US returns the ball against Nadia Petrova from Russia during their 4th round US Open match at the USTA Billie Jean King National...

Victoria Azarenka of Belarus plays against Nadia Petrova of Russia on the seventh day of the 2009 Wimbledon Tennis Championships at the All England...

...blows a kiss af Russia's Maria Sharapova blows a kiss after winning against Russia's Nadia Petrova during the French Open tennis second round match on May 27, 2009 at Roland Garros Stadium...

Russia's Maria Sharapova returns a ball to Russia's Nadia Petrova during the French Open tennis second round match on May 27, 2009 at Roland Garros Stadium...