Novak Djokovic Just Won Something Even Better Than the US Open

When you win the US Open, there are plenty of perks. Prize money, international recognition, and a huge trophy are only a few of the winnings . . . but for Novak Djokovic, who defeated Roger Federer and went home a US Open champ on Sunday, the best reward was something a little unexpected.

When Stephen Colbert welcomed the tennis star onto his new late-night show, the host offered Djokovic a prize that risked his own personal safety: the chance to serve tennis balls at Colbert while he hid behind Captain America's shield. This might seem like no big deal to you, but Colbert was rightfully a little nervous — Djokovic has been known to serve balls up to 130 miles per hour! Give the hilarious video a watch, and you'll understand why his The Late Show With Stephen Colbert appearance was Novak's favorite prize.