Sofia Kenin of the United States hits a return during the women's singles quarterfinal match against Danielle Collins of the United States at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Xinhua/Gao Jing)

Sofia Kenin of the United States hits a return during the women's singles quarterfinal match against Danielle Collins of the United States at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Xinhua/Gao Jing)

Sofia Kenin of the United States serves during the women's singles quarterfinal match against Danielle Collins of the United States at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Xinhua/Gao Jing)

Danielle Collins of the United States reacts during the women's singles quarterfinal match against Sofia Kenin of the United States at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020 (Xinhua/Gao Jing)

Sofia Kenin of the United States hits a return during the women's singles quarterfinal match against Danielle Collins of the United States at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Xinhua/Gao Jing)

Pablo Busta of Spain hits a return during the men's singles quarterfinal match against Novak Djokovic of Serbia at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Novak Djokovic of Serbia takes a rest during the men's singles quarterfinal match against Pablo Busta of Spain at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Novak Djokovic (L) of Serbia greets Pablo Busta of Spain after their men's singles quarterfinal match at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Stefanos Tsitsipas of Greece serves during the men's singles quarterfinal match against Andrey Rublev of Russia at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Novak Djokovic of Serbia reacts during the men's singles quarterfinal match against Pablo Busta of Spain at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Novak Djokovic of Serbia hits a return during the men's singles quarterfinal match against Pablo Busta of Spain at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Stefanos Tsitsipas of Greece hits a return during the men's singles quarterfinal match against Andrey Rublev of Russia at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Novak Djokovic of Serbia hits a return during the men's singles quarterfinal match against Pablo Busta of Spain at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Novak Djokovic of Serbia hits a return during the men's singles quarterfinal match against Pablo Busta of Spain at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Andrey Rublev of Russia serves during the men's singles quarterfinal match against Stefanos Tsitsipas of Greece at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Andrey Rublev of Russia hits a return during the men's singles quarterfinal match against Stefanos Tsitsipas of Greece at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Novak Djokovic of Serbia hits a return during the men's singles quarterfinal match against Pablo Busta of Spain at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Stefanos Tsitsipas of Greece hits a return during the men's singles quarterfinal match against Andrey Rublev of Russia at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Novak Djokovic of Serbia celebrates victory after the men's singles quarterfinal match against Pablo Busta of Spain at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Pablo Busta of Spain reacts during the men's singles quarterfinal match against Novak Djokovic of Serbia at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)

Pablo Busta of Spain reacts during the men's singles quarterfinal match against Novak Djokovic of Serbia at the French Open tennis tournament 2020 at Roland Garros in Paris, France, Oct. 7, 2020. (Photo by Aurelien Morissard/Xinhua)