Novak Djokovic of Serbia serves the ball during the semifinal match against Dominic Thiem of Austria at the ATP World Finals tennis tournament at the O2 arena in London.
AP Photo/Frank Augstein
Novak Djokovic of Serbia returns the ball to Dominic Thiem of Austria during their semifinal match at the ATP World Finals tennis tournament at the O2 arena in London.
AP Photo/Frank Augstein
Novak Djokovic of Serbia juggles with his racket during the semifinal match against Dominic Thiem of Austria at the ATP World Finals tennis tournament at the O2 arena in London.
AP Photo/Frank Augstein
Novak Djokovic of Serbia leaves after losing his semifinal match against Dominic Thiem of Austria at the ATP World Finals tennis tournament at the O2 arena in London.
AP Photo/Frank Augstein
Novak Djokovic of Serbia, left, shakes hands with Dominic Thiem of Austria at the end of their semifinal match ATP World Finals tennis tournament at the O2 arena in London. Thiem b...
AP Photo/Frank Augstein
Novak Djokovic of Serbia returns the ball to Dominic Thiem of Austria during their semifinal match at the ATP World Finals tennis tournament at the O2 arena in London
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Novak Djokovic of Serbia, right, shakes hands with Alexander Zverev of Germany after winning match point during their singles tennis match at the ATP World Finals tennis tournament...
AP/PTI Photo
Novak Djokovic of Serbia plays a return to Diego Schwartzman of Argentina during their singles tennis match at the ATP World Finals tennis tournament at the O2 arena in London.
AP Photo/Frank Augstein
Novak Djokovic of Serbia plays a return to Diego Schwartzman of Argentina during their singles tennis match at the ATP World Finals tennis tournament at the O2 arena in London.
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Serbia's Novak Djokovic reacts after missing a shot against Spain's Rafael Nadal in the final match of the French Open tennis tournament at the Roland Garros stadium in Paris, Fran...
AP Photo/Alessandra Tarantino
Serbia's Novak Djokovic holds the runner-up trophy after losing against Spain's Rafael Nadal in the final match of the French Open tennis tournament at the Roland Garros stadium in...
AP Photo/Christophe Ena
Serbia's Novak Djokovic celebrates winning his semifinal match of the French Open tennis tournament against Greece's Stefanos Tsitsipas in five sets, 6-3, 6-2, 5-7, 4-6, 6-1, at th...
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Serbia's Novak Djokovic serves against Greece's Stefanos Tsitsipas in the semifinal match of the French Open tennis tournament at the Roland Garros stadium in Paris, France.
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A bandage or athletic tape is seen in Serbia's Novak Djokovic's neck in the quarterfinal match of the French Open tennis tournament against Spain's Pablo Carreno Busta at the Rolan...
AP/PTI
Serbia's Novak Djokovic celebrates winning his fourth round match of the French Open tennis tournament against Russia's Karen Khachanov in three sets 6-4, 6-3, 6-3, at the Roland G...
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Serbia's Novak Djokovic checks on a linesman after a ball spun off his racket in the fourth round match of the French Open tennis tournament against Russia's Karen Khachanov at the...
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Serbia's Novak Djokovic plays a shot against Russia's Karen Khachanov in the fourth round match of the French Open tennis tournament at the Roland Garros stadium in Paris, France.
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Serbia's Novak Djokovic wears a face mask with the national flag as he enters the court for his fourth round match of the French Open tennis tournament against Russia's Karen Khach...
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Serbia's Novak Djokovic looks up at the sky as light rain fall in the third round match of the French Open tennis tournament against Colombia's Daniel Elahi Galan at the Roland Gar...
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Serbia's Novak Djokovic celebrates winning his second round match of the French Open tennis tournament against Lithuania's Ricardas Berankis at the Roland Garros stadium in Paris, ...
Eight-time Australian Open champion Novak Djokovic reportedly asked for players to be moved to private houses with tennis courts, with his requests rejected