Champions are often defined by their trophies, but the people who know them best usually point to something less visible. For Simone Vagnozzi, the coach who has helped guide Jannik Sinner to the top of men's tennis, the world No. 1's greatest strength is not his forehand, his movement or even his remarkable composure under pressure. It is his refusal to ever feel satisfied. That relentless pursuit of improvement, according to Vagnozzi, is the tr…
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