Matsuyama got off to an explosive start, making four birdies in his first five holes. A dropped shot at the seventh was recovered on the 443-yard, par-4 ninth hole, before back-to-back birdies on 15 and 16 took him clear of his nearest challengers.
“It was difficult in the heavy rain, but fortunately I got off to a really good start,” he explained. “In those conditions, your body stiffens and your grip gets wet, so I was just trying to stay relaxed and keep my equipment dry.
“Even though I have a lead, I will not think about that and will just start fresh tomorrow. I’m going to try not to think about the prizes on offer because it might influence my game – I want to concentrate on individual strokes. But it would be wonderful to win, even though I would feel a bit out of my league.”
Alone in second place, MacManus signed for a second successive round of 4-under-par 67. The 21-year-old, who is in his senior year at the University of Arizona, made four birdies, two on each nine, in his bogey-free third round. The Queenslander now finds himself three off the lead, and three ahead of third-placed Yosuke Asaji of Japan.
The winner of the tournament will receive an invitation to compete in the 2011 Masters Tournament.