What are the rules for replacing tennis balls?
What are the rules for replacing tennis balls? The tennis ball used in the game is yellow and made of rubber compound. The outer surface is evenly covered with wool fibers, and there are no stitches at the seams. The diameter of the ball is 6.35-6.67 cm, and the weight is 56.7-58.5 grams. 1. 7-9…
























