WASHINGTON — Look out, McEnroe.

There’s a new tennis wild man and his name is Andy Samberg.

The “SNL” alum stars in the new HBO mockumentary “7 Days in Hell,” about a fictional tennis rivalry between he and Kit Harington (a.k.a Jon Snow from “Game of Thrones”), who battled it out in a legendary 2001 match that lasted an incredible seven days.

It co-stars Will Forte, Fred Armisen, June Squibb, Howie Mandel, Soledad O’Brien, David Copperfield, Lena Dunham and Mary Steenburgen.

It’s narrated by “Mad Men” star Jon Hamm.

It also features real-life tennis stars like John McEnroe, Serena Williams and Chris Evert.

The film is written by Murray Miller (“Girls”) and directed by Jake Szymanski (“Brooklyn Nine-Nine”).

The movie is currently streaming on HBO Go.

Watch the trailer below: