Oh my, Gauff lost in an upset? Saw just the ending of a clip on CBC highlights, and saw her in a heated debate with the umpire. What happened? That's too bad for her.
Edit - found a clip. Gauff says the ump called the shot out just before Gauff hit it, so she let up on her return with her return hitting the net. The out call by the umpire was ruled in after video review.
https://twitter.com/user/status/1818263980030427284