A fired up Roger Federer has booked his 14th Australian Open semi-final appearance, the defending champion defeating Czech Tomas Berdych in straight sets.
The Swiss maestro butted heads with the chair umpire during a feisty opening set on Wednesday night but regrouped to claim a 7-6 (7-1) 6-3 6-4 victory in two hours and 14 minutes.
South Korea's Hyeon Chung, who continued his dream run with a straight-sets win over Tennys Sandgren, awaits in the semi-finals with Federer aiming to claim a 20th grand slam crown.
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