How does one of the best male players in tennis history choose a new coach? Pick somebody who has been there with you — and who you beat to get there. Novak Djokovic’s decision to hire Andy Murray for at least the Australian Open has renewed interest in one of the most interesting psychological relationships in sport: The tennis player and their coach. Djokovic has always sought out a coach who has scaled the mountain he chose, hiring Boris Becker, Andre Agassi and Goran Ivanisevic throughout hi