I can’t find any real explanation for this. Are there different balls? Some harder, some faster… or is it just a habit from players?
In: 56
Considering the amount of force tennis balls get hit with, there is a huge difference in quality between brand new balls and ones that have been knocked around for 7-9 games (when they get replaced in ATP tournaments). So players can take advantage of this difference in their serving strategy to get a slight edge over their opponent. New balls will be more aerodynamic and give you more speed. Used ones will generate more spin due to deformations in the fuzz.
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