Australian Open 23.01.2013 Durchmarsch der Favoriten © Bild: APA/Barbara Walton AUSTRALIA TENNIS AUSTRALIAN OPEN GRAND SLAM © Bild: APA/AHMAD YUSNI AUSTRALIA TENNIS AUSTRALIAN OPEN GRAND SLAM © Bild: APA/Barbara Walton AUSTRALIA TENNIS AUSTRALIAN OPEN GRAND SLAM © Bild: APA/Barbara Walton AUSTRALIA TENNIS AUSTRALIAN OPEN GRAND SLAM © Bild: Reuters/TIM WIMBORNE Roger Federer of Switzerland hits a return to Jo-W © Bild: APA/Mast Irham AUSTRALIA TENNIS AUSTRALIAN OPEN GRAND SLAM