Serena Williams’ 20th Wimbledon has ended abruptly.

Williams retired in the first set after she hurt her leg in an opening-round match against Aliaksandra Sasnovich of Belarus.

Williams slipped on the grass while hitting a forehand in the fifth game. She winced and began to walk gingerly, and after losing that game went to the locker room.

She returned, but with the score 3-all, her leg buckled during a rally and she crumpled to the court. Williams rose and cried as she walked to the net to concede.

A seven-time Wimbledon champion, Williams was again seeking a record-tying 24th major title. Her most recent came in early 2017.