ORANGE BALL - Kids are converted into more than just one-shot wonders. Time to throw in some tactics, problem-solving and guides to sportsmanship and leadership. They'll know all of the rules and will be serving and returning. GREEN BALL - It’s time for kids to play on full size courts. Now it’s all about growing their game by fine tuning and refining the techniques they’ve learned so far. Kids should now be in a position to act more independently on court.