When he won the French Open last June – capping a long-held dream and holding all four Slams, the first man to do so in 47 years – the world was Novak Djokovic’s oyster.

That now seems like a long time ago. He won only one title, the Rogers Cup, during the second half of 2016 and lost his No. 1 ranking to Andy Murray. (Because he had won so many tournaments in 2015 and had to defend all those points under the ranking system, he actually lost points, nothing failing in tennis quite like success.)

At the Australian Open, he lost in the third round in a tournament that was won by the returning Roger Federer, who defeated Rafael Nadal. ...

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