The Czech star rises to No. 5 in the world but will need time to recuperate.

"Of course I will not be a player anymore in the future, but I would love to be involved in tennis," US Open champion says.

"I am at the peak of my abilities and I want to keep going exactly the same way," world No. 1 says of quest for more Grand Slam titles.

Relive title triumphs of every 2015 US Open champion in this one-minute recap.

"There were times my rivals brought out the best in me; there were times they brought out the worst," said the Hall of Famer.

Watch US Open champion pelt a serve at Late Show host Stephen Colbert, armed with Captain America's shield.

Many found the New York crowd's treatment of Novak Djokovic appalling, but for the Serb it was just another defeatable obstacle to overcome.