Polish Tennis Star

Agnieszka Radwanska of Poland pulled off a stunning upset, beating the defending U.S. Open champion 6-4, 1-6, 6-2 in a third-round match that took a startling turn Saturday.

Maria Sharapova seemed to take control by winning eight games in a row, giving her a 2-0 lead in the final set. Then, she fell apart and never won again.

The 30th-ranked Radwanska the former junior champ at Wimbledon and the French Open played with poise and smarts, creeping closer and closer to the service box on second serves, hoping to unnerve the two-time Grand Slam winner. At times, Radwanska walked nearly halfway from the baseline to the net as Sharapova got ready, then backed off at the last second.