Green Ball Tennis is a developmental stage in youth tennis, typically aimed at players around the ages of 9 to 10, though this can vary depending on skill level. At this stage, players move from the orange ball to the green, low-compression tennis ball which is a bit faster and bouncier than the orange ball but still slower than the standard yellow ball used by adults. The green ball serves as a bridge between the orange ball and the full-sized yellow ball, making it ideal for players transitioning to more competitive tennis.