Novak Djokovic says it's a "gamble" to continue playing at the Australian Open and that his abdominal injury could have an impact on the rest of his season. The world No. 1, however, is prepared to take the risk.

The Serbian, an eight-time champion in Melbourne, sustained a "muscle tear" during a thrilling five-set win over Taylor Fritz on Friday. He didn't train the following day and took to Rod Laver Arena on Sunday evening dosed up on painkillers as he topped big-serving Canadian Milos Raonic in four sets to reach the quarterfinals.

Djokovic said the pain was "bearable" and he "somehow managed to find a way and win."