Roger Federer had previously lost all three of his quarterfinals at Melzer . The 29-year-old beats Jurgen Melzer to set up clash with last year 's runner-up Gael Monfils . `` I thought I served well the whole match , '' Federer told the ATP website after firing 18 aces , his best in a two-set match . Fourth seed Roger Federer will play dark horse Gael Monfils in other semifinal . Jurgen Melzer became the Fourth unseeded player to reach last four since 2007 .
Roger Federer had previously lost all three of his quarterfinals at Melzer . The 29-year-old beats Jurgen Melzer to set up clash with last year 's runner-up Gael Monfils . Fourth seed Roger Federer will play dark horse Gael Monfils in other semifinal . Jurgen Melzer became the Fourth unseeded player to reach last four since 2007 .