Petrova had more winners, 15-2, and 15 aces despite not serving as well as Stosur, although the Russian had a pile of unforced errors.
"It was tough battle in the third set, and I was really pumped when I broke her at 6-5 when she was serving for the match," Petrova said. "I knew this was my time to win the match."
Fish was hit with the hindrance rule for yelling, "Come on!" before Ebden got to the ball after Fish's volley winner in the next-to-last game of the match. It was the same penalty that sent Serena Williams into a rage against an official during the U.S. Open final she lost to Stosur.
Stosur had lunged at a shot but Williams yelled the same thing as Fish before the ball landed. Ebden threw up his hands, clearly annoyed by Fish's outburst.
"It was right under the umpire's nose, so it was pretty clear what happened," Ebden said. "I did get there in reasonable time to hit the ball. I still had a decent play on it."
The International Tennis Federation rule can be interpreted either by giving the point to the opponent if the hindrance was considered deliberate or by replaying the point if the hindrance was considered unintentional. By giving the point to Ebden, chair umpire Felix Torralba interpreted Fish's yell as deliberate interference. Fish refused the traditional post-match handshake with Torralba.
"I don't think it had an effect on him making or missing the shot. But I feel like maybe (play) a let there, unless he hits the shot in. Then that's different," said Fish, who was serving. "I've never done that before on tour in my life. I was just trying to fire myself up."
Other winners Monday were: No. 7 Marion Bartoli, No. 20 Maria Kirilenko, No. 21 Roberta Vinci, No. 12 Nicolas Almagro, No. 13 Giles Simon, and Pablo Andujar.
Top-ranked Americans Bob and Mike Bryan survived a marathon second-round doubles match, beating the Spanish duo of Marcel Granollers and Feliciano Lopez 6-7 (2), 7-6 (4), 17-15.
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