Serena retires injured in Madrid

MADRID: Serena Williams pulled out of the Madrid Open on Monday after aggravating a leg injury in a first-round match against Francesca Schiavone.

Second-seeded Williams retired after losing the first set 6-4 to the Italian, citing a problem with her right knee.

A downcast Williams, who had difficulty bending her right knee, said she had made too many commitments with her schedule this year and was paying the price.