OAKVILLE - Hunter Mahan fired a flawless eight-under-par 64 on Friday to take a two-shot lead over John Merrick after two rounds of the US PGA Tour's Canadian Open. Mahan's eight birdies were enough to seize the lead from early second-round pace-setter Merrick, who equalled the Glen Abbey course record with a 10-under 62 that included an eagle and eight birdies. Mahan had a 13-under-par total of 131, with Merrick on 11-under 133. Former Masters champion Bubba Watson was alone in third place after a 67 for 135, and it was a further stroke back to Patrick Reed (68) and Australian Aaron Baddeley (68) on 136. Mahan, who played in the final group on Sunday at the British Open and finished ninth in the year's third major, birdied his last three holes to get past Merrick. –AFP