Barnes had four birdies in his first six holes in grabbing the lead. He has a 1-stroke lead over Ryan Moore, whose 7-under 64 was also bogey-free. Brian Davis, Carl Pettersson and Charlie Wi are tied for third at 6-under. Four more golfers are at 5-under.
Barnes opened with two pars but then birdied Nos. 3 and 4. After a par at the fifth hole, he had back back-to-back birdies at 6 and 7. On the second nine, Barnes had birdies on each of the four odd-numbered holes.
All of Moore's seven birdies came after the fifth hole. He also birdied Nos. 6 and 7 and got to 4-under with birdies a 9 and 10. Also like Barnes, Moore had birdies at 13, 15 and 17.
The event, which has a 40-player field, is the first PGA Tour-sanctioned tournament in Southeast Asia. It carries a purse of $6 million with $1.08 million going to the winner Sunday.
However, money won at the tournament won't be counted toward the player's PGA Tour total nor will the eventual champion be credited with an official win.