Dayana Yastremska of Ukraine celebrates after winning the first round women's single match against Coco Gauff of the U.S. at the Wimbledon Tennis Championships in London.

Dayana Yastremska of Ukraine shakes hands with Coco Gauff of the U.S., left, after winning the first round women's single match at the Wimbledon Tennis Championships in London.

Coco Gauff of the U.S. reacts after losing her first round women's single match against Dayana Yastremska of Ukraine at the Wimbledon Tennis Championships in London.

Dayana Yastremska of Ukraine returns the ball to Coco Gauff of the U.S. during their first round women's single match at the Wimbledon Tennis Championships in London.

Coco Gauff of the U.S. returns the ball to Dayana Yastremska of Ukraine during their first round women's single match at the Wimbledon Tennis Championships in London.

Dayana Yastremska of Ukraine reacts during her first round women's single match against Coco Gauff of the U.S. at the Wimbledon Tennis Championships in London.

Coco Gauff of the U.S. reacts during her first round women's single match against Dayana Yastremska of Ukraine at the Wimbledon Tennis Championships in London.

Dayana Yastremska of Ukraine returns the ball to Coco Gauff of the U.S. during their first round women's single match at the Wimbledon Tennis Championships in London.

Dayana Yastremska of Ukraine returns the ball to Coco Gauff of the U.S. during their first round women's single match at the Wimbledon Tennis Championships in London.