
Novak Djokovic gives the trophy a kiss after defeating Roger Federer in the U.S. Open men's final on September 13, 2015 in New York.

Djokovic (right) and Federer, ranked first and second in the world, met in the final at Flushing Meadows for the first time since 2007.

Djokovic shakes hands with Federer after winning his 10th grand slam title, avenging his defeat to the Swiss eight years ago.

The Serbian triumphed in four sets, winning 6-4 5-7 6-4 6-4.

Federer, seeking his 18th grand slam title and sixth U.S. Open crown, had not dropped a set during the tournament before the final.

Djokovic was able to nullify Federer's recent adoption of aggressive tactics to attack his opponents' service game.

Actor Gerard Butler watched the final in Djokovic's box. He starred in the film "300," which Djokovic said he watched the previous night and said inspired him to win his third grand slam title this season.