Garcia, who was tied for the lead after the first round, is now at 11-under 131. He had eight birdies and a pair of bogeys in the second round at the 6,917-yard, par-71 Phoenix Country Club.
'I'm really happy with the way I've been playing,' Garcia said. 'Not only the last couple of days, but the last three months. At the start of the week, if you'd have given me 11 under, I would have thought I'd be leading by more.'
Garcia leads Denmark's Thomas Bjorn and Japan's Daisuke Maruyama, who both shot 65 in the second round.
'I didn't drive the ball as well as I wanted early on,' Bjorn said. 'But on the back nine I played really good golf and hit a lot of iron shots really close.'
American Hank Kuehne, who won last week's Franklin Templeton Shootout title with partner Jeff Sluman and shared the first-round lead with Garcia and Japan's Jun Kikuchi, held the lead briefly on the front nine but faltered the rest of the way. He finished with a 4-over 75 and is 10 strokes behind Garcia.
Defending champion Kaname Yokoo struggled and shot a 75, missing the cut, which came at 5-over 147.
Copyright 2003 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.