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.

Andy Roddick made a huge revelation about the Novak Djokovic and Andy Murray partnership as the 2003 US Open champion shares he was told that the newly retired Briton rejected multiple offers from "top male and female" players before accepting the Serb's invitation to work with him.

In what was a huge surprise to tennis fans, Novak Djokovic recently announced that former player Andy Murray would be assigned as his coach from the upcoming Australian Open next year.Murray retired after the Paris Olympics this year,