10 and Under Tennis, using the Quickstart Tennis play format, is structured for kids to learn tennis and rally and play quickly in a way that is both enjoyable and rewarding. Tailoring equipment and courts so they are sized appropriately for kids makes the game more accessible-and more fun-by allowing kids to get involved right from the start. 10 and Under Tennis, using the Quickstart Tennis play format, is structured for kids to learn tennis and rally and play quickly in a way that is both enjoyable and rewarding. Tailoring equipment and courts so they are sized appropriately for kids makes the game more accessible-and more fun-by allowing kids to get involved right from the start.