World number three Victoria Azarenka roared back from a set down to beat Agnieszka Radwanska 6-7 6-0 6-2 and reach the semi-finals of the Australian Open on Tuesday.
The Wimbledon semi-finalist, who beat Pole Radwanska on the way to winning in Sydney earlier this month, looked in trouble when she lost a first set tiebreak 7-0.
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However, Azarenka turned the tables in the second set, running the legs off Radwanska from the baseline, before carrying the momentum into the third to seal the win in a little more than two hours.
Azarenka will meet world number one Caroline Wozniacki or Kim Clijsters in the semi-finals.
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