Melbourne Open

Djokovic into quarters but admits playing on in Melbourne is a gamble

The 33-year-old suffered an injury he described as "a tear" to his right side against Taylor Fritz in the third round, but was fit enough to beat Milos Raonic 7-6(4) 4-6 6-1 6-4 in the early hours of Monday morning to reach the quarter-finals.

The world number one said he has been having extensive treatment and was on painkillers, but declined to actually explain what the injury was when asked.