The 10 & Under Tennis program is about fitting tennis to kids based on age and physical size. Any child can start playing tennis almost immediately, even if he or she has never picked up a racquet. To make it easier for them, we changed the court sizes, racquet sizes, the balls, the scoring system and even the net height. Like other popular youth sports, 10 & Under Tennis stresses the importance of play and team competition. Note: 10 & Under is the name of the program but it is for older children as well. Our clinics are organized into small groups by age and level. Stage color represents age, with multiple levels at each stage.