US Open Men's Semifinals (35 images)

Switzerland's Roger Federer, second seed, reacts after defeating Novak Djokovic of Serbia, third seed, during the semi-final match at the U.S. Open tennis championship at the U.S. National Tennis Center on September 6, 2008 in Flushing Meadows, New York. Federer won 6-3, 5-7, 7-5,6-2. (UPI Photo/Monika Graff)

Switzerland's Roger Federer, second seed, returns the ball to Novak Djokovic of Serbia, third seed, during the semi-final match at the U.S. Open tennis championship at the U.S. National Tennis Center on September 6, 2008 in Flushing Meadows, New York. (UPI Photo/Monika Graff)

Novak Djokovic of Serbia, third seed, reacts after losing a game to Switzerland's Roger Federer, second seed, during the semi-final match at the U.S. Open tennis championship at the U.S. National Tennis Center on September 6, 2008 in Flushing Meadows, New York. Federer won 6-3, 5-7, 7-5,6-2. (UPI Photo/Monika Graff)

Novak Djokovic of Serbia, third seed, returns the ball to Switzerland's Roger Federer, second seed, during the semi-final match at the U.S. Open tennis championship at the U.S. National Tennis Center on September 6, 2008 in Flushing Meadows, New York. (UPI Photo/Monika Graff)