Serbian Tennis player Novak Djokovic has not won a Grand Slam in over 12 months. However, with Andy Murray as coach, the upcoming Australian Open might break the streak for the 37-year-old. Djokovic has been seen in recent times to have a go at his coaching staff during games in recent times. “Novak can get really down on himself. He’s been mouthing off at his box, but I don’t think he’ll be doing that to Andy and that’ll help him stay positive when something bad happens and he’ll be so much stronger, mentally, just for that reason. He’ll be on his best behavior,” said former player Martina Navratilova. Speaking at length to BBC Sport, Murray recalled, “I was playing golf, and we’d been exchanging messages. Novak had messaged me, just wanting to chat. Then I was on the 17th hole of the golf course and the guy I was playing with said: ‘Do you know what’s next?’. I was like: ‘No, not really’. He said: ‘Do you have any plans to do any coaching?’ And …