Jannik Sinner is in the quarterfinals of a Grand Slam tournament for the third time. © ANSA / ANDY RAIN
Coach Vagnozzi: “This is Sinner’s greatest weapon right now”
Simone Vagnozzi, Jannik Sinner's trainer since February, attributes the South Tyrolean's improvement on grass to a certain change, among other things.
July 04, 2022
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