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

Two-time defending champion Jessica Pegula was eliminated in the third round of the National Bank Open, falling 3-6, 6-4, 6-1 to Anastasija Sevastova on Friday.

She’s definitely playing like one of the top players in the world right now,” Gauff says of Mboko. “Her ranking will definitely match that soon.” Gauff knows firsthand how tough the 18-year-old ...