In a titanic battle lasting 2hrs 48mins, left-handed Pervak eased past Wozniacki 2-6, 6-3, 7-6 (7/1) in the first shock of the season-opening WTA tournament.

Eighth-seeded Wozniacki had looked in control as she reeled off the first set in just 29 minutes.u00a0But the Russian-born Pervak found her range in the second set and had the Dane constantly under pressure with her swinging left-handed groundstrokes.