Rafael Nadal

Rafael Nadal, of Spain, challenges a call during the second set against Juan Martin del Potro, of Argentina, during the semifinals of the U.S. Open tennis tournament

Rafael Nadal, of Spain, celebrates after defeating Dominic Thiem, of Austria, during the quarterfinals of the U.S. Open tennis tournament, in New York.

Rafael Nadal, of Spain, returns a shot to Dominic Thiem, of Austria, during the quarterfinals of the U.S. Open tennis tournament in New York.

Rafael Nadal, of Spain, reacts after defeating Nikoloz Basilashvili, of Georgia, during the fourth round of the U.S. Open tennis tournament, in New York.

Rafael Nadal, of Spain, celebrates after defeating Karen Khachanov, of Russia, 5-7, 7-5, 7-6 (7), 7-6 (3) during the third round of the U.S. Open tennis tournament in New York.

Rafael Nadal, of Spain, heads toward the net during a second-round match against Vasek Pospisil, of Canada, at the U.S. Open tennis tournament in New York.

Rafael Nadal, of Spain, reacts after defeating Marin Cilic, of Croatia, during the Rogers Cup men's tennis tournament in Toronto.

Rafael Nadal, of Spain, celebrates after defeating Benoit Paire, of France, during the Rogers Cup men's tennis tournament in Toronto.

Rafael Nadal of Spain closes his eyes in dejection after losing a point during the men's singles semifinals match against Serbia's Novak Djokovic at the Wimbledon Tennis Championsh...

Rafael Nadal of Spain reacts after losing a point during his men's singles semifinals match against Serbia's Novak Djokovic, at the Wimbledon Tennis Championships, in London.

Rafael Nadal of Spain celebrates defeating Juan Martin Del Potro of Argentina in their men's quarterfinal match at the Wimbledon Tennis Championships in London.

Rafael Nadal of Spain reacts after winning a point in his men's singles match against Czech Republic's Jiri Vesely, on day seven of the Wimbledon Tennis Championships, in London.

Rafael Nadal of Spain falls after returning the ball to Mikhail Kukushkin of Kazakhstan, during their men's singles match, on the fourth day of the Wimbledon Tennis Championships i...

Rafael Nadal of Spain celebrates defeating Mikhail Kukushkin of Kazakhstan, in their men's singles match, on the fourth day of the Wimbledon Tennis Championships in London.

Spain's Rafael Nadal celebrates winning his men's singles match against Dudi Sela, of Israel, on the second day of the Wimbledon Tennis Championships in London.

Lucas Pouille of France, left, celebrates after beating Rafael Nadal of Spain in their match on day four of the Aspall Classic at the Hurlingham Club, London.

Eleven-times French Open winner Spain's Rafael Nadal bites the trophy as he celebrates after the men's final match of the French Open tennis tournament against Austria's Dominic Th...

Spain's Rafael Nadal celebrates winning his semifinal match of the French Open tennis tournament against Argentina's Juan Martin del Potro in three sets 6-4, 6-1, 6-2, at the Rolan...

Spain's Rafael Nadal celebrates winning his quarterfinal match of the French Open tennis tournament against Argentina's Diego Schwartzman in four sets 4-6, 6-3, 6-2, 6-2, at the Ro...

Spain's Rafael Nadal grimaces as he plays Argentina's Guido Pella during their second round match of the French Open tennis tournament at the Roland Garros stadium in Paris.