Germany's Angelique Kerber reacts as she plays Ukraine's Anhelina Kalinina during their first round match of the French Open tennis tournament at the Roland Garros stadium Sunday, May 30, 2021 in Paris. (AP Photo/Michel Euler)

Germany's Angelique Kerber returns the ball to Ukraine's Anhelina Kalinina during their first round match of the French Open tennis tournament at the Roland Garros stadium Sunday, May 30, 2021 in Paris. (AP Photo/Michel Euler)