Maria Sharapova defeats Nadia Petrova to reach U.S. Open quarterfinals . Whether it 's an hour or three hours Sharapova has won 11 three - set matches in 2012 . Marion Haas wins 12 of 13 games to a 1 - 6 , 6 - 2 , 6 - 0 win over Petra Sabine . Sam Stosur ends year - old Laura Robson 's impressive U.S. Open run with a 6 - 4 6 - 4 win .
Maria Sharapova defeats Nadia Petrova to reach U.S. Open quarterfinals . Sharapova has won 11 three - set matches in 2012 . Marion Haas wins 12 of 13 games to a 1 - 6 , 6 - 2 , 6 - 0 win over Petra Sabine . Sam Stosur ends year - old Laura Robson 's impressive U.S. Open run with a 6 - 4 6 - 4 win .