First Slam is an international tennis tournament for the youngest tennis talents from around the world, taking place in Osijek, Croatia from July 20 to July 25, 2026. The tournament is open to girls and boys born in 2017 and younger, offering them a unique opportunity to take their first competitive steps in a safe, supportive, and truly international environment.

First Slam brings together young players from different countries and cultures, encouraging the development of core sporting values such as fair play, friendship, respect, and love for the game. The tournament is designed with a strong focus on development, experience, and positive atmosphere, supported by professional organization adapted to the needs of young children and the first experience of tennis matches on all four Grand Slam surfaces, which makes this event unique in the world.