MELBOURNE, Australia — 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.

"I know this court well. I have never managed to win the title here and this man - indicating Djokovic - is the only one responsible. Now I am here to try to sabotage him so that he does not win another Australian Open!" said Murray before telling the story behind the new collaboration.