Defending champion Novak Djokovic showed yet more mental and physical resilience to beat German sixth seed Alexander Zverev and reach the Australian Open semi-finals.
The top seed fought back to win 6-7 (6-8) 6-2 6-4 7-6 (8-6) in Melbourne.
The Serb will face Russian qualifier Aslan Karatsev, who beat an injured Grigor Dimitrov, on Thursday.
Karatsev, ranked 114th in the world, is the first man in the Open era to reach the last four on his Grand Slam debut.
BBC