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.

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Novak Djokovic and Andy Murray have started their on-court preparations at the Australian Open ahead of the Serbian’s bid for a 25th grand slam title this month. Djokovic has said former rival Murray will bring a “fresh look” and “unique perspective” as his coach as he seeks to win a record-exending 11th Australian Open.