The recently retired Andy Murray is going to team up with longtime rival Novak Djokovic as his coach, they both announced Saturday, with plans to prepare for — and work together through — the Australian Open in January.

It was a stunning bit of news as , a pairing of two of the most successful and popular players in the sport, both of whom are sometimes referred to as members of a so-called Big Four that also included Roger Federer and .

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