Oudin beats Petrova in thriller
Melanie Oudin continued her remarkable run in the US Open after overcoming Nadia Petrova 1-6 7-6 (7-2) 6-3 to reach the quarter-finals.
The 17-year-old American had already beaten Maria Sharapova and fourth seed Elena Dementieva to reach the fourth round, but looked to be out of her depth as Petrova dominated the first set.
However, the world number 70 responded in a topsy-turvy second set, eventually taking it on the tie-break before she broke twice in the final set to reach the quarter-finals.
Oudin will now play ninth seed Caroline Wozniacki for a place in the semi-finals after the Dane beat the 2004 Open champion Svetlana Kuznetsova 2-6 7-6 (7-5) 7-6 (7-3).
"I didn't think I started off too well and Nadia served unbelievable," said Oudin.
"But I stayed in there with her in the second set and she gave me a few free points and I got my confidence and I believed I could do it, and I did it.
"It's kind of hard to explain how I've done it.
"There are no tears because I believed I could do it and it's like now I know that I do belong here.
"This is what I want to do and I can compete with these girls no matter who I'm playing. I have a chance against anyone."