Green balls are typically used for 10 and under players or adults new to the game. They are still decompressed like the red and orange but to a lesser extent. The players play on a full sized tennis court at this stage.  Green balls are useful for any level of beginners to help develop technique and timing.

When matches are played with green balls they typically use normal tennis scoring, 15, 30, 40 etc and they play sets to 4 games instead of 6. 

Green ball players would play Rogers Rookie Tour events, or Rising Star U10 events, along with club events.