Anastasija Sevastova wasn’t expecting a result like this. A year ago, she wasn’t even sure she’d ever play tennis again.

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 ...

There, Osaka produced another big win, as Wiktorowski achieved something he had failed to do during his four-year stint as ...