When Novak Djokovic jumped on the super-coach bandwagon and hired Boris Becker, the appointment came straight out of left field and appeared to be a baffling one.

Three-time Wimbledon champion Becker had never shown any inclination toward coaching, was neck deep with his media and business commitments and as a classic serve-and-volleyer, his playing style could not have been more different to Djokovic's baseline power game.

But just as Ivan Lendl found the lure of working with Andy Murray hard to resist, Becker was intrigued by the challenge of working with a man who, like him, owned six Grand Slam titles.