Djokovic is dealing with a leg injury that makes it painful for him to move at times during the match. He was spotted trying all kinds of things on the court to help alleviate the effects of the injury but it didn't impact his tennis. He's playing as great as ever which made some question the severity of it.
He wasn't happy about it ranting to the media that they always question his injuries but not of other players. Reacting to that, Toni Nadal hinted at Djokovic talking about his nephew while adding that he does believe the Serbian has an injury:
"I know perfectly well that there is a certain controversy regarding the contradiction generated by the excellent games that Novak has played and his gestures on the courts, and his repeated statements about the ailment he is suffering from in one thigh."
"They have sent me a sentence from his press conference in which, with notable annoyance, he complains that the authenticity of his injury has been questioned and, instead, that "they are victims to others when they also suffer them." I am not very susceptible by nature, but I understand that "others" refers to Rafael, the only "other" injured tennis player among the contenders for the title."
"For years we have been able to verify how injuries, both in the case of my nephew and in that of other players, have had an immediate negative consequence in their matches or, if not, they have suffered it at the end of them. For years we have been able to verify how injuries, both in the case of my nephew and in that of other players, have had an immediate negative consequence in their matches or, if not, they have suffered it at the end of them."