Nickelodeon will be presenting Kids Tennis Day this Saturday in Melbourne Park, Australia.

Australian professional tennis player Lleyton Hewitt will headline the fourth annual event. Hewitt will be joined by several of the world’s best tennis players as well as SpongeBob SquarePants, Dora the Explorer, Patrick Star, the Teenage Mutant Ninja Turtles and more.

Throughout the day, kids will be able to experience and learn how to play tennis, see Nickelodeon character stage shows, watch players practice and more.