Protest Stops U.S. Open Semifinal Match

The U.S. Open semifinal match on Thursday night between Coco Gauff and Karolina Muchova was delayed by more than 40 minutes early in the second set by what appeared to be a group of environmental protesters in the upper levels of Arthur Ashe Stadium.

The protest confused fans, television commentators and the players themselves, who were trying to understand what the group was protesting and why the match had been delayed so long.

This is a developing story.