Germany's Alexander Zverev plays a return to Russia's Roman Safiullin during their second round match on day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Michel Euler)

Germany's Alexander Zverev celebrates after winning a point against Russia's Roman Safiullin during their second round match on day four of the French Open tennis tournament at Roland Garros in Paris, France, Wednesday, June 2, 2021. (AP Photo/Michel Euler)