LONDON — Fifth-seeded Sara Errani of Italy has been eliminated in straight sets by Puerto Rican teenager Monica Puig in an early upset on the opening day of Wimbledon.

Errani, runner-up at last year’s French Open, lost 6-3, 6-2 to the 65th-ranked player on Monday in the first match on Court 18 of the grass-court Grand Slam.

The 19-year-old Puig, playing her first grass-court tournament as a pro, had 38 winners. She squandered five match points before hitting a forehand winner to close out the match, dropping her racket to the turf and covering her face in her hands.

Errani, who had reached the semifinals or better at three of the last five Grand Slams, withdrew from last week’s grass-court warmup at Eastbourne with a leg injury.