CARY, N.C. (AP) – Mark Wiebe shot a 6-under 66 Saturday to take a one-shot lead and set an SAS Championship scoring record after two rounds.

Wiebe, in position to become the first player to win in his Champions Tour debut since Mark McNulty took the 2004 Outback Steakhouse Pro-Am, had a 13-under 131 total.

Dick Mast, who started the second round tied for fourth at 5 under, capped his 65 with a 50-foot eagle putt on the par-5 17th. He was tied for second with Dana Quigley, who birdied the par-4 18th and had a 66.

If Wiebe wins, he would qualify for the Constellation Energy Senior Players Championship in Baltimore next month.

“I’m not surprised how I’m playing. I’m surprised how low the scoring is,” he said. “We all play to be close to winning on Sunday. I just want a shot.”

Wiebe was 4 under on the front nine, including a 30-foot birdie putt on the par-4 fifth. He stayed consistent on the back nine and birdied the par-4 16th with another long putt.

In his professional career, Wiebe is winless in three tries with the lead after two rounds. The last time he was in the final group with the lead was the 2001 Tucson Open, where he finished tied for fifth place.

Mast opened his round with two birdies and made the turn at 8 under with a birdie on the par-5 seventh. He got to 9 under after 12, but bogeyed the par-4 14th for the second straight day before coming back with two birdies and the eagle in three of the last four holes.

“It was a nice finish but I wanted to birdie the last hole,” Mast said. “I got some good breaks starting out and it really calmed me down. I’m very happy with my position.”

Massy Kuramoto and Jay Haas were four shots behind. First-round co-leader Boonchu Ruangkit stumbled down the stretch and was in a group with Don Pooley, Des Smyth, Keith Fergus, 2003 SAS champion D.A. Weibring and 2001-02 champ Bruce Lietzke at 8 under.

Wiebe came into the SAS Championship playing well on the Nationwide Tour. In his last six Nationwide events, he shot a combined 30 under and had an average score of 69.64, but did not have any wins and earned about $20,000.

AP-ES-09-22-07 1948EDT