Djokovic sees storm coming

New crop of young talent threatens 'Big Four' dominance of Grand Slams

With a crop of talented young players such as Kei Nishikori and Milos Raonic knocking on the door of the exclusive men's Grand Slam club, the "Big Four" hegemony over the game's top tournaments might be coming to a close, said Novak Djokovic.

World No 1 Djokovic, Roger Federer, Rafa Nadal and Andy Murray have shared 36 of the last 39 Grand Slam titles.