A couple guys just experienced the best thing that could ever happen for tennis fans… Serena Williams crashed their game!

That’s right, Serena Williams (who recently did a Sports Illustrated spread) crashed a simple game in San Francisco last night. She happened to be doing an evening stroll at Mission Dolores Park with her fiancé Alexis Ohanion — I guess she felt it upon herself to teach these guys a thing or two about their swing?

Though she couldn’t play a full set with the guys, she did stay and posed for a few pics. What a gal!

Check out the footage via TMZ: