Former champion Lindsay Davenport has pulled out of Wimbledon because of a knee injury.

Davenport, who won the title in 1999, was due to face Argentina's Gisela Dulko in a second round match on Thursday.

However, she informed tournament officials of her decision to withdraw just hours before the match.

The American, who withdrew from last week's warm-up event in Eastbourne, was troubled by the injury during her first round victory over Renata Voracova.