Anastasia Pavlyuchenkova reached her first U.S. Open quarterfinal, beating seventh-seeded Francesca Schiavone in three sets on Monday.
The 17th-seeded Russian won 5-7, 6-3, 6-4 in two hours, 41 minutes, as the youngest player left in the draw defeated the oldest.
The 20-year-old Pavlyuchenkova led Schiavone 6-1, 4-1 in her first Grand Slam quarterfinal at the French Open earlier this year before the Italian rallied for victory.
There were 16 breaks of serve in 31 games in the match. The two players combined for 21 double-faults.
The 31-year-old Schiavone won last year's French Open and lost in the final this year.