Both women have played sixteen times before since Wimbledon first round in 2006 - and Azarenka has dominated her Polish opponent 13 times. In fact Azarenka has beaten Radwanska consecutively in their last seven matches. They last played the Doha semis last year when Azarenka won 6-3, 6-3.
But there is something more beside trying to win over Azarenka, Radwanska will have to bear with the loud grunting of Azarenka, which has frustrated her in the past. Remember, Radwanska said she was ''angry'' and ''lost a lot of respect'' for Azarenka after the pair squared off at the Dubai Open in 2012 because of the excessive noise coming from the other side of the court.
So beside winning the match, Radwanska will have to control herself when her opponent grunts at crucial moments of the game.
And by the way do you know the top grunters and scream queens of tennis? I will write about it some other time.
For the time being enjoy the quarter final between Azarenka - Radwanska, scheduled for 21 January 2014 at Approximately* 01:30 GMT at Rod Laver Arena - and Azarenka's screams.
If you are one of the fans located at different destination and miss the chance to visit the stadium to watch your favourite team, you can now watch the match live on your laptop or desktop computer, FREE, provided you have an internet connection, from the links given below: