Coco Gauff: 5 things to know about the tennis star's summer of triumph
At 19, tennis sensation Cori "Coco" Gauff, is already a U.S. Open veteran — and fans including the Obamas, Beyoncé's mom Tina Knowles and Justin Bieber are rooting for her. Why it matters: Gauff became the first American teen since Serena Williams more than two decades ago to reach the…
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