GOT's Jon Snow's amazing transformation into baby-faced tennis brat in 7 Days in Hell trailer

The back and forth of tennis just got a lot funnier, and we've got Andy Samberg and Game of Thrones' Jon Snow (aka Kit Harrington) to thank.

The trailer for the new 45-minute HBO comedy 7 Days in Hell has dropped, and it sends up the game of tennis in the most star-studded way. Andy and Kit play court rivals in the parody and they get a comedic assist from an impressive line-up of actors and real-life tennis pros.

Check out the trailer above and play spot the celebrity cameo. You've been served!

7 Days in Hell premieres July 11 on HBO.