Nalbandian too tough for Federer

David Nalbandian is convinced he has the Indian Sign over Roger Federer after his 3-6 7-6 (7/1) 6-4 6-3 victory in their fourth-round clash in the US Open at Flushing Meadows.

Federer was aiming for his first victory against Nalbandian, who also defeated him for the junior crown here in 1998.