Coco Gauff is disappointed in her mistake-filled performance during a first-round Wimbledon loss. She also is determined not to dwell on it for too long. The U.S.

Dayana Yastremska made headlines Tuesday by completing one of the biggest upsets at Wimbledon with her first-round victory in straight sets over No. 2 seed Coco Gauff. But the unseeded Ukrainian tennis player isn’t a complete unknown.