Djokovic has had a poor start to the year by his standards.

Novak Djokovic and Goran Ivanisevic are to go their separate ways, the tennis world number one announced on Wednesday, ending a five-year association which yielded 12 Grand Slams.

Novak Djokovic won a record-extending 10th Australian Open title on Sunday despite battling an injury that would have forced most players to quit, his coach Goran Ivanisevic said, adding that the world number one kept getting "crazier and crazier".