Novak Djokovic and Andy Murray have known each other for a quarter of a century. They played from the age of 12, meeting 36 times as professionals, including 10 Grand Slam matches. Yet they've never been able to talk shop and freely trade all sorts of thoughts — about tennis and otherwise — until now.

Novak Djokovic got the bright idea to hire the recently retired Andy Murray as his coach, at least through the Australian Open.

In his bid to land a 25th Grand Slam, the 37-year-old has enlisted the help of Andy Murray, an opponent he faced 36 times and who knows as much as anyone about the strengths of his game.