Comments by "Kasumi Rina" (@KasumiRINA) on "What tennis pros look at when they pick a ball" video.

@wnuspl8776 even if you watch tennis sporadically, you know the top 5 players, give or take.
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@nsebast In theory, like they said, you want it faster on first serve to gain advantage (ace or serving so fast, opponent hits out on return), and more control on second serve because you don't want to have a double fault.
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