Hiring Becker a risk, concedes Djokovic

Novak Djokovic accepts he has taken a risk by hiring Boris Becker as his head coach.

The Serbian is bidding for a fourth straight title at the Australian Open after three seasons where he has had more success than any other male player.

But, after losing the US Open final to Rafael Nadal last year and ceding his number one ranking to the Spaniard, Djokovic decided he needed a change.