Poland's Agnieszka Radwanska upset Russian fourth seed Vera Zvonareva 6-3 6-2 to claim the biggest title of her career at the Pan Pacific Open on Saturday.
The 22-year-old, seeded ninth, started slowly when she dropped the first two games but roared back to win the next five as Zvonareva prowled the baseline muttering angrily to herself.
Once Radwanska had taken the opening set on a huge forehand down the line, she came out with all guns blazing in the second and wrapped up a dominant victory by forcing Zvonareva into another wild forehand error.
