Becker: Djokovic wasn’t working
Boris Becker has admitted the last six months coaching Novak Djokovic were “challenging” and claims the Serbian star was not practising hard enough.
Source: http://www.skysports.com/tennis/news/12040/10686232/boris-becker-says-novak-djokovic-wasnt-practising-as-hard-over-past-six-months