Theoretically, there are 24 tennis balls, but people only distinguish the types of balls based on 4 speeds, 3 types of shell and 2 main factors that create bounce. Some types have a combination of all these factors, so there are only 16 types. And in fact, in sporting goods stores, there are usually only 4 main types:
- Ball without compression, medium speed, extra duty
- Ball with compression, medium speed, regular
- Ball with compression, medium speed, extra duty
- Ball with compression, slow speed, extra duty
What do the numbers on the ball say?
The numbers stamped on the ball are only to help players on adjacent courts to identify their ball (in the case of the same brand).
Why do some balls have red letters, others black letters?
Red letters are usually used on clay courts and black letters are used on hard courts.
What is the difference between “extra duty” and “regular” coats?
Because the hardcourt causes the ball’s outer shell to wear out quickly, “extra duty” is used for hard courts. Meanwhile, “regular” is considered ideal for clay courts because the surface is softer. “Regular” will be very damaged if played on hard courts.
How are the balls without compression compared to regular and compressed balls?
Non-compression balls are generally stiffer than compression balls, except for one brand called Tretorn. However, unlike compression balls, uncompressed balls are more durable, with better bounce retention. When the outer felt is lost, balls without compression fly faster, bounce and spin more. But then, the ball was not suitable for a tennis match.
