Novak Djokovic ’s decision to hire Andy Murray has been branded an “act of war”. The former rivals shocked the tennis world over the weekend, announcing that the newly-retired Brit would coach the 24-time Grand Slam champion during the off-season and Australian Open.

Nicolas Mahut has warned Andy Murray that he could be subject to Novak Djokovic's "violent" outbursts when they begin working together.

Former tennis player Mats Wilander has said Novak Djokovic's surprise decision to bring Andy Murray into his box for the Australian Open is an "excellent move".