Nadal's knee injury forces him out of semis at Indian Wells

INDIAN WELLS, Calif. (AP) - Rafael Nadal has withdrawn from the semifinals of the BNP Paribas Open because of a knee injury.

Nadal had been set to play longtime rival Roger Federer later Saturday.

The Spaniard's right knee flared up in the second set of his 7-6 (2), 7-6 (2) ...