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How Jannik Sinner and the team that made him world No. 1 became a tennis Rorschach test

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NEW YORK — Since Jannik Sinner began to assert himself as the best tennis player in the world, there has been a narrative around the 23-year-old Italian and his inimitable mop of red hair.

Terrific talent; phenomenal team.

Simone Vagnozzi, 41, the jovial Italian with the big, dark eyes — the master tactician. Then Darren Cahill, a laid-back but intensely competitive Australian, his resumé filled with know-how wrought from leading players to the pinnacle of the sport.

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Umberto Ferrara, Sinner’s trainer, worked hand-in-glove with the two coaches.