She also revealed that she is focused on the tough matches that await her in the latter stages of the tournament.
"I think my game is getting there," she said after her fourth-round match.
"Every match you build up a little bit as you reach the big games now. I always take what I get, easy or tough, I always try my best.
"There are no easy matches from here on in."
Azarenka will face Svetlana Kuznetsova in the quarter-finals.