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Maria Sharapova reached the US Open quarter-finals for the first time since her 2006 championship run with a 6-1, 4-6, 6-4 victory over Russian compatriot Nadia Petrova on Sunday night.
Sharapova will next face French 11th seed Marion Bartoli, who beat Czech fifth seed Petra Kvitova in three sets.
Defending champion Samantha Stosur set up a last-eight showdown with top seed Victoria Azarenka.
Stosur beat British teen Laura Robson 6-4, 6-4 and World No. 1 Azarenka ousted Georgia's Anna Tatishvili 6-2, 6-2.
