Melbourne: Third seed Roger Federer booked his 12th Australian Open tennis semi-final appearance with a 7-6(4), 6-2, 6-4 win over Tomas Berdych here on Tuesday.

"I'm very, very happy. Tomas has caused me a lot of problems over the years," said Federer, who notched his 80th win at Melbourne Park, making the Australian Open his most successful Grand Slam in terms of matches won.