Rafa Nadal
Rafael NadalReuters

Rafael Nadal has responded to comments made by Novak Djokovic's father suggesting that the Spaniard is no longer 'sportmanlike' after Djokovic has replaced him as world number one.

"While he was winning, but not anymore and that is not sportsmanlike" Srdjan Djokovic said when asked whether his son and Nadal were friends.

Nadal has responded by imploring Djokovic senior to speak to his son about their relationship.

"Djokovic's father should talk to his son," Nadal is quoted in Marca. "I've always got on very well with him and I still do. I've lost lots of matches against him and vice-versa, but we've never had a problem."

"People are entitled to their opinions," the French Open winner continued. "It's not my place to respond to anyone, especially without having heard or read these comments."

Nadal was adamant that he and the current ATP world number one, Djokovic, would have no problems calling each other, should a misunderstanding arise between the two.

"[We] would have no problem in calling each other," Nadal concluded.

Djokovic's father also commented on Roger Federer and Andy Murray. Srdjan Djokovic has hit out at Federer's personality, suggesting it is at odds with his playing style.

"Federer is perhaps the best tennis player in history, but as a person he is quite the opposite," said Djokovic's father.

With regards to Wimbledon champion Andy Murray, Djokovic senior plainly explained that is impossible for both to remain good friends as their competitiveness on the court extends to their personal lives.

"They can't be best friends because they're fighting for the biggest titles and, at the end of the day, lots of money as well," Srjdan Djokovic explained.

He does suggest, however, once they both retire, their relationship will be more than cordial.

"But they are perfectly sporting rivals and I'm sure they will be great friends when their careers are over," he said.

Unlike Nadal, Federer and Murray are yet to respond to these comments.