Tennis balls come in three main types — regular duty, extra duty, and high altitude — plus a stage system (red, orange, and green) for juniors learning the game. Extra-duty suits hard courts, regular-duty suits clay and indoor courts, and the right choice depends mainly on your court surface.
Regular duty vs extra duty
The core difference is felt thickness. Extra-duty balls have a thicker, more durable felt designed to withstand the abrasive surface of hard courts, where balls wear out fastest. Regular duty balls have a thinner felt suited to clay and indoor courts, where the surface is gentler, and a thicker felt would just add unnecessary fluffiness and slow the ball down.
High-altitude balls
Played at altitude, tennis balls travel faster through thinner air. High-altitude balls are pressurised differently to compensate, flying more like a normal ball would at sea level. Unless you regularly play somewhere significantly elevated, you won't need these.
Pressurised vs pressureless
Most balls used for regular play and matches are pressurised — they have a compressed air core that gives them liveliness, but they gradually lose pressure and bounce over time, even unopened. Pressureless balls rely on the rubber compound itself for bounce rather than internal air pressure, so they last far longer and are popular for ball machines, coaching, and practice sessions where consistency over months matters more than peak liveliness.
The junior stage ball system
- Red stage: the softest, slowest ball, used on smaller courts for the youngest beginners.
- Orange stage: a step-up-in-pace and bounce, used on a mid-sized court as juniors build technique.
- Green stage: close to a full-pace ball but slightly slower, used as a bridge to full-size, full-pace tennis.
The stage system exists because a full-pace yellow ball moves too fast for beginners to track and control — starting on slower balls builds technique before speed becomes a factor.
Our recommendation
Match your ball to your court: extra duty for hard courts, regular duty for clay or indoor. If you're coaching or using a ball machine, pressureless balls save money over time. For juniors, follow the stage system rather than jumping straight to full-pace balls — it makes learning the game far easier.
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