Jonathan Byrd fired a six-under-par 66 to take a three-shot lead after two rounds on Friday as the weather disrupted AT and T Classic got back on schedule.

Starting on the back nine, Byrd fired seven birdies en route to a 12-under total of 132 in the $5.5-million tournament.

Byrd notched three birdies in a row from the third before his only bogey of the day, at the par-five sixth.

The 2002 PGA Tour Rookie of the Year, Byrd was three in front of Ryan Palmer and Kenny Perry, who was part of a five-way tie for the lead after the first round, which was completed on Friday morning.

Byrd, 30, tied for ninth place here last year, and has one top-10 finish in 13 starts this year. His last PGA Tour victory came last July at the John Deere Classic.

Perry, who posted a 69, bogeyed the par-five fourth but rebounded with birdies at six, nine, 11 and 16 to move to nine-under 135.

Perry is trying to bounce back after shooting 81 in the last round of the Players Championship on Sunday.

"I take a lot from last week," he said. "Eighty-one is disappointing, a terrible round of golf. I knew I was playing well, knew I was putting well and just be patient. I had a lot of people call me and just tell me to be patient, your game's coming. And it is. I'm playing a lot better golf."

Palmer endured a rough start to the day. After parring his first four holes, Palmer double-bogeyed the par-four fifth hole. He also the ninth, but eagled 10 to join Perry at nine-under.

Charles Howell (69), David Toms (69) and Parker McLachlin (70) were tied for fourth on eight-under 136.

Defending champion Zach Johnson carded a 70 for a share of 10th.

Johnson was cruising until a bogey at the sixth, the only blemish in a round that included three birdies and left him at five-under 139.

Last year, Johnson defeated Japan's Ryuji Imada on the first hole of a playoff to add a second 2007 title in Georgia to his unexpected Masters triumph.

"I'm trying to forget about last year," Johnson said. "I mean, if anything, just keep that confidence on this course. But, you know, the shots and everything that took place, I'm trying to put that behind and stick to the present."

Johnson also won this event in 2004 and tied for second in 2006.

"I played nice for going into the weekend," Johnson said. "I played pretty well, put myself in position to make some putts, made some, missed a lot, too. You can always say that I guess. The greens are perfect considering all the rain."

AFP