 If you liked
Free!
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 ...then you might like
Ping Pong the Animation
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Protagonist for both shows are quiet and are also very talented in what they do. Both are about sports but more importantly a friendship of two great athletes.
Both Free! and Ping Pong The Animation have a main character who is calm and greatly admire the sport they practice. Moreover, the main characters find that their friends are also their greatness opponents.