Roger Federer the defending champion has reached his 14th Australian Open semi-final with a victory over Tomas Berdych today. Federer won in straight sets 7-6 6-3 6-4 & will now play unseeded 21-year old Hyeon Chung of South Korea in the last four. Hyeon the world number 58 came through his quarter-final match beating American Tennys Sandgren 6-4 7-6 6-3.