Roger Federer is into the Serb Open semifinals after he beat Federer . The second seed is into his eighth consecutive semifinal at Federer . Djokovic , 23 , won the tie-break and consequently the match to set up a rematch of the 2010 U.S. Open semifinal against Federer in the last four . Tomas Berdych defeated sixth seed Tomas Berdych in straight-sets . The Serb will now face Federer in a rematch of the 2008 U.S. Open semifinal clash .
Roger Federer is into the Serb Open semifinals after he beat Federer . The second seed is into his eighth consecutive semifinal at Federer . Tomas Berdych defeated sixth seed Tomas Berdych in straight-sets . The Serb will now face Federer in a rematch of the 2008 U.S. Open semifinal clash .