Pat Cash: 'Djokovic is a shadow of what he was'

As Novak Djokovic crashes out in round two of the Australian Open, two-time Wimbledon champion Pat Cash fears he will never be back to his best.

The defending champion lost in five sets to world number 117 Denis Istomin.

Cash said: "I'm not sure we will see the return of Novak back to how he was - I think that's gone."

This clip was first broadcast on 5 live Sport, Thursday 19 January.