Defending champion Novak Djokovic is unsure if he will be able to play in the fourth round of the Australian Open after he survived an injury scare to battle past American Taylor Fritz.
World number one Djokovic was hampered by a side injury that restricted his movement, although he still recorded a 7-6 (7-1) 6-4 3-6 4-6 6-2 victory.
Djokovic is set to meet 14th seed Milos Raonic in the next round, but said: "I know it's a tear and I don't know if I will recover from that in two days. I don't know if I will step on court.