People have started to accept, he says, that there is no more Roger Federer, no more Rafael Nadal and — soon — no more Novak Djokovic.

People have started to accept, he says, that there is no more Roger Federer, no more Rafael Nadal and — soon — no more Novak Djokovic.

Novak Djokovic's frustrations got the better of him in the build-up to the Madrid Open as he prepares to face Matteo Arnaldi ...