Coco Gauff has received advice from Rick Macci—the former coach of Serena Williams—on how to improve her weakest point at the moment: her serve. The world No. 2 survived her third-round match ...

Two-time Grand Slam champ Coco Gauff is well aware of her serve gaffes, but she's handling them in stride throughout the Canadian Open.

I just would like to serve how I do in doubles!” the American said. We talked to a leading mental coach about the 'weird'—but not uncommon—phenomenon.