Pinpoint accuracy helped former US PGA champion Keegan Bradley grab a four-shot lead at the halfway stage of the CIMB Classic in Malaysia on Friday.       

Bradley fired seven birdies in his second round of six-under-par 66 to lead the $7 million PGA Tour event on 13-under after overnight leader Ryan Moore failed to match the fireworks of his opening 63 and settled for a level par 72.

Bradley, who won his sole major championship in 2011, said his accuracy needed to continue on the narrow layout if he was to claim a fourth PGA Tour title.             

"I'm hitting the ball super straight, it’s hard to remember a time when I have been more dialled in than this last two days," the American told reporters.             

"I'm really in control of my ball and putting my ball really well.             

"The guy who keeps hitting fairways this week is the guy who is going to win, so I'm going to keep hitting fairways, be aggressive and try and win this tournament."             

Fellow American Moore mixed three birdies with three bogeys in his level par round to sit second in the 78-man field event, which is co-sanctioned by the Asian Tour.             

Thailand's Kiradech Aphibarnrat continued to carry the flag for the local players as he briefly shared the lead on Friday before signing for a 69 and a share of third place on eight-under with American Chris Stroud (69).