Coco Gauff of the United States reacts as she plays China's Xinyu Wang during the Berlin WTA tennis tournament on Thursday in Berlin, Germany. The Associated Press

BERLIN — Newly crowned French Open champion Coco Gauff was stunned on her return to action, losing to Chinese qualifier Wang Xinyu 6-3, 6-3 at the Berlin Open. The second-ranked Gauff won at Roland-Garros less than two weeks ago for her second Grand Slam title.

The American amassed 25 unforced errors and seven double faults in her loss to Wang. Gauff had a bye to the second round at the grass-court tournament, a warmup for Wimbledon. Top-ranked Aryna Sabalenka finished off Rebeka Masarova 6-2, 7-6 (6) in a match that was suspended Wednesday after one set because of a slippery court.

Mbappe out of the hospital

MIAMI — Kylian Mbappe was discharged from hospital after an acute case of gastroenteritis and it is not known when he will be able to play for Real Madrid at the Club World Cup.

Coach Xabi Alonso said the France international was in “rough shape.”