California teenager Coco Vandeweghe rallied to upset Wimbledon runner-up Vera Zvonareva 2-6, 7-5, 6-4 Thursday to reach the quarter-finals of the WTA San Diego Open.
Qualifier Vandeweghe, ranked 205th in the world, shook off her poor start to topple the ninth-ranked Russian, who is seeded third in the hard court event.

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