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.

Andy Murray has said he does not want Djokovic to suppress his emotions on court and is even willing to be the target of any angry outbursts at the Australian Open.