Serbia's Novak Djokovic returns the ball to Italy's Matteo Berrettini during their quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Wednesday, June 9, 2021 in Paris. (AP Photo/Michel Euler)

Serbia's Novak Djokovic returns the ball to Italy's Matteo Berrettini during their quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Wednesday, June 9, 2021 in Paris. (AP Photo/Michel Euler)

Italy's Matteo Berrettini reacts as he plays Serbia's Novak Djokovic during their quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Wednesday, June 9, 2021 in Paris. (AP Photo/Michel Euler)

Serbia's Novak Djokovic returns the ball to Italy's Matteo Berrettini during their quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Wednesday, June 9, 2021 in Paris. (AP Photo/Michel Euler)

Tennis lovers support Serbia's Novak Djokovic playing Italy's Matteo Berrettini during their quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Wednesday, June 9, 2021 in Paris. (AP Photo/Michel Euler)

Spectators leave to respect the 11PM curfew due to the COVID-19 pandemic while Italy's Matteo Berrettini plays Serbia's Novak Djokovic in a quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Wednesday, June 9, 2021 in Paris. (AP Photo/Michel Euler)

Italy's Matteo Berrettini returns the ball to Serbia's Novak Djokovic during their quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Wednesday, June 9, 2021 in Paris. (AP Photo/Michel Euler)

Serbia's Novak Djokovic reacts as he defeats Italy's Matteo Berrettini in a quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Wednesday, June 9, 2021 in Paris. (AP Photo/Michel Euler)