It's World Tennis Day and we're celebrating by serving up some hot shots of some famous hotties wielding racquets.

Genie Bouchard, Winnie Harlow and Livvy Dunne are leading the way ... they're all aces in our book.

On the reality TV front, we've got tennis looks from "Too Hot To Handle" star Georgia Hassarati, plus Liberty Poole from "Love Island."

Tennis anyone?!?

Irina Shayk's modeled just about everything at this point, and she's throwing her hat in the ring here too.

This ain't exactly Wimbledon, but you get the point ... so check out the gallery and see if you can hold serve.