Roger Federer sets up Juan Martin Del Potro quarter-final at US Open after Kohlschreiber stroll
Swiss maestro eases past German in straight sets
Five-time champion Roger Federer set-up a mouthwatering US Open quarter-final clash against 2009 winner Juan Martin del Potro on Monday.
Third seed Federer defeated Philipp Kohlschreiber 6-4, 6-2, 7-5 to take his record over the German to 12-0.
Del Potro, who defeated Federer in the 2009 final for his only grand slam title, saved two match points to knock out Austrian sixth seed Dominic Thiem 1-6, 2-6, 6-1, 7-6 (7-1), 6-4 in his fourth-round match.