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.

Murray and Djokovic’s blockbuster partnership ensures one thing ahead of the Australian Open, as his young rivals grow ever stronger

Novak Djokovic failed to deliver a convincing answer to Zheng Qinwen when asked about Andy Murray and the Briton made sure to let the Serb hear it. On Thursday, the record 24-time Grand Slam champion teamed up with the Chinese tennis star for a charity mixed doubles match versus the newly retired Briton and Victoria Azarenka.