Stefanos Tsitsipas has been competing in the Ultimate Tennis Showdown for the past three weekends, and it's safe to say life is going well for the Greek. So well, that instead of huffing and puffing during the breaks (like a lot of other players), he's breaking into song. 

The world No. 6 is 5-1 in UTS match play, which features a whole new set of rules like 10-minute quarters, 15 seconds between points and mid-match coaching as well as interviews.

He kept the spirit of song alive after the match too, which he won 3-1 over Alexei Popyrin. 

In his spare time, Tsitsipas is producing content as always, but his latest masterpiece is something different. 

Who knew the 21-year-old was a Gossip Girl fan?

Tsitsipas is currently at the top of the UTS rankings.

He's slipped ahead of No. 2 Matteo Berrettini and No. 3 Richard Gasquet, with three more weekends to go.