Novak Djokovic battled past Alexander Zverev and into the Australian Open semi-finals before confirming his injury is still playing a major role in his tournament.
Djokovic was short of his best against the world number seven, starting three of the four sets in the match poorly and needing to work his way into them.
He, though, explained that was down to the injury and how long it takes to stretch it out on court.
"With these type of conditions I need to warm up and I still felt it would take time to feel I could rotate well," Djokovic said after his 6-7, 6-2, 6-4, 7-6 win.
"It was a close tie break [in the first set] and after that I felt I moved better.
"I hit slightly more aces, which is a miracle for me. Down to the last shot, it was anyone's match.
"It was a great battle and congratulations to Sacha for a great tournament - we pushed each other to the limit."
On the current state of his injury, Djokovic added: "I haven't been practicing on my days off. I will keep doing the same.
"People don't realise how much affect the 14 days quarantine had on players' bodies. It has taken it's toll."
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