Daniela Hantuchova and Chris Stubbs look at what next for Novak Djokovic after his shock Australian Open retirement.

Daniela Hantuchova and Chris Stubbs look at what next for Novak Djokovic after his shock Australian Open retirement.

The tennis world has reacted in shock to Novak Djokovic’s sensational retirement just one set into his semifinal blockbuster with Alexander Zverev.

The 10-time champion may have played his last Australian Open.

Jim Courier and John Millman unpack what Novak Djokovic's future in the sport holds after his sudden retirement at the Australian Open.

Jim Courier and John Millman unpack what Novak Djokovic's future in the sport holds after his sudden retirement at the Australian Open.

Analysis - It's local supporters at the Australian Open who have been the worst behaved, with actions like booing Novak Djokovic after his shock...

Australian Open finalist Alexander Zverev has gone into bat for rival Novak Djokovic, pleading with the Rod Laver Arena crowd to not boo the 10-time...

Australian Open finalist Alexander Zverev has gone into bat for rival Novak Djokovic, pleading with the Rod Laver Arena crowd to not boo the 10-time...

The 10-time champion had one last message for his critics before leaving the country.