Novak Djokovic broke out in song after his US Open quarter-final win against Taylor Fritz on Tuesday night (5 September).
The tennis legend led the crowd in a rendition of the famous Beastie Boys tune “Fight For Your Right” after his straight-sets victory.
“Everybody ready?” Djokovic asked, grabbing the microphone in his post-match interview.
“You’ve got to fight, for your right, to party!”
The Serbian star will face Ben Shelton in his semi-final match.
Shelton is the youngest American male to reach the last four of the US Open since 1992.