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.

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 ...

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.