Penn Championship XD Tennis Balls
The Penn Championship tennis ball is the best selling tennis ball in the USA. It's a pressurized ball, and cheaper than the more durable, higher-quality Penn ATP or ProPenn. Still, it's a ball that will play well for at least two sets of most competitive singles at the NTRP 4.5 level or lower. After that, the Penn Championship ball is still good for the ball hopper and can serve for drilling practice for a long time to come.