Video: Rafael Nadal adds to U.S. Open highlight reel with forehand pass

Rafael Nadal unleashed this stunning forehand passing shot during his 6-7 (4), 6-4, 6-3, 6-1 victory over Philipp Kohlschreiber in the fourth round of the U.S. Open on Monday.

Nadal -- who hit this gem in the first round -- lost a set for the first time in four matches, but he's yet to be broken in 56 service games.

"Four matches without losing the serve is great," Nadal said. "I felt at the beginning [of Monday's match] I didn't serve my best. But then in the next sets, I am very happy the way that I served. I was able to win a lot of points and start a lot of points in a good position."