Serena Williams beats 2009 Australian Open Svetlana Kuznetsova in three sets . World number one to beat last year 's runner - up Sara Errani in last four . She 's also as focused as I 've ever seen her . '' Italian advance to semifinals after beating Agnieszka Radwanska in straight sets .
Serena Williams beats 2009 Australian Open Svetlana Kuznetsova in three sets . World number one to beat last year 's runner - up Sara Errani in last four . Italian advance to semifinals after beating Agnieszka Radwanska in straight sets .