Maria Sharapova beats Nadia Petrova to reach U.S. Open quarterfinals . Maria Sharapova 's impressive record of winning matches that go to three sets in 2012 shows no sign of ending after the Russian beat Nadia Petrova in the U.S. Open fourth round to set up a quarterfinal meeting with Marion Bartoli . The Russian will play former world Marion Bartoli wins 12 of 13 games to secure 1-6 , 6-2 , 6-0 win over Petra Kvitova . Sam Stosur ends 18-year-old Laura Robson 's impressive U.S. Open run with a 6-4 6-4 win .
Maria Sharapova beats Nadia Petrova to reach U.S. Open quarterfinals . The Russian will play former world Marion Bartoli wins 12 of 13 games to secure 1-6 , 6-2 , 6-0 win over Petra Kvitova . Sam Stosur ends 18-year-old Laura Robson 's impressive U.S. Open run with a 6-4 6-4 win .