Former world number one Victoria Azarenka admits her back was against the wall in her Australian Open fourth-round match, before digging deep to beat China's Zhu Lin in three sets.
It was not until well after 2am AEDT that Azarenka was able to seal victory, coming from a set down to win 4-6, 6-1, 6-4 after two hours and 40 minutes on court inside Rod Laver Arena.