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World No 1 Djokovic has been the player to beat over the last couple of seasons, winning five of the eight grand slam finals he has competed in and raising the bar of the men's game. 

And it is because of this success that Srdjan believes Federer and Nadal have become sore losers and turned on his son. 

Speaking to Serbian newspaper Kurir, Djokovic's father said: "Federer is perhaps still the best tennis player in history, but as a man he's the opposite. 

"He attacked Novak at the Davis Cup in Geneva (in 2006), he realised that he was his successor and was trying to discredit him in every way. Novak's success is an amazing thing and something that one cannot understand." 

And Srdjan holds the same grudge against Nadal, adding: "Nadal was his best friend while he was winning. When things changed, they were no longer friends. This is not sport. This is what Novak has in him, but others don't." 

However, while attacking Federer and Nadal, Srdjan Djokovic did have some kind words for Andy Murray. 

"I have never, not even for a second, felt jealousy from Andy’s family," he said. 

"Andy’s mother went in the locker room, in Rome, to congratulate Novak, his team and family. They cannot be best friends as they fight for the most important titles, and lots of money. 

"But they are more than correct rivals and I am sure that after they finish their professional careers, they will be great friends."/ Telegraph