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.

Former two-time French Open finalist Alex Corretja admitted he was in "total shock" when the Novak Djokovic and Andy Murray collaboration news dropped but also backed the partnership to succeed.

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".