Srebotnik now faces Swiss 10th seed Patty Schnyder , who beat France's Emilie Loit 7-6 (7-4) 5-7 6-2.
BBC: SPORT | Tennis | Williams sisters beaten in Paris
Petrova will face Russian compatriot and fifth seed Dinara Safina, who beat Katarina Srebotnik of Slovenia 6-3 6-1.
BBC: SPORT | Tennis | Petrova and Williams both advance
Safina defeated Slovenia's Katarina Srebotnik 6-2 6-4 to ensure her showdown with Clijsters.
BBC: SPORT | Tennis | Clijsters survives Golovin ordeal
Camille Pin of France beat Spain's Marta Marrero 6-1 6-2, and Katarina Srebotnik of Slovenia defeated Italian Maria Elena Camerin 3-6 6-2 6-4.
BBC: SPORT | Tennis | Clijsters marks comeback with win
Jens Gerlach is a former coach of Anastasia Myskina, while Simon Walsh helped Samantha Stosur and Katarina Srebotnik, among others, into the top 100.
BBC: Carl Maes
The American looked sharper in the second but Srebotnik displayed impressive resolve and, after breaking in game nine, sealed the triumph on her third match point when Williams sent a forehand wide.
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