The query has been raised about what number of extra Slams Djokovic can win earlier than he calls 'recreation, set, match' on his profession. But at 36, he's in the most effective form of his life and Ivanisevic would not see any motive why he cannot maintain going till he's 40, gathering extra titles alongside the way in which.

"The way he has taken care of his body, he can do it," the Croatian added. "I don't know if he is going to have the motivation [to carry on until 40], it's one way to go. He can play another two or three years at a high level.

"Maybe he wins 26 or 27 [Grand Slams]. Who is aware of? He can win one other two this yr and that will be unbelievable to do the Golden Slam. I haven't got a magic ball, however he is wholesome, he is prepared, he is enjoying unbelievable tennis and he is motivated for each Grand Slam.

"He has already achieved unbelievable things, but I still think he has a few Grand Slams in him left."