The world number one Serena Williams has opened her title defence with a clinical 6-2 6-1 victory over Poland's Urszula Radwanska in the first round of the Australian Tennis Open.
The 11-time grand slam champion is bidding for a fifth Melbourne title and played with her right leg heavily strapped, but appeared in no discomfort as she wrapped up the match in an hour and 13 minutes.
Williams was troubled by a sore knee in a straight-sets loss to Russia's Elena Dementieva in the Sydney International final, but was never threatened by the 72nd-ranked Radwanska, clubbing 26 winners as she raced through the second set in just 33 minutes.
She'll play either another American, Jill Craybas, or the Czech Petra Kvitova in the second round.
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