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Coco Gauff’s new serve and a U.S. Open win over Ajla Tomljanovic built on old foundations

On the night that she debuted her new service motion, it was Gauff's tennis foundations that propelled her to victory.

Coco Gauff is fixing her serve to start the U.S. Open – and the rest of her tennis career

But then Gauff learned that MacMillian, a Canadian educated in America and based in South Africa, was available. And then her ...