Utah pro Milan Swilor, who consistently posts a hot round in this tournament, carded seven birdies on Friday for a 6-under-par 66 to claim the second-round lead in the Colorado Open.

Thanks in part to a 70-foot birdie putt, Swilor held a 2-stroke advantage at the halfway point over Shane Bertsch of Parker, who shot 68. Swilor was at 8-under 136 and Bertsch at 138.Swilor, 40, of Sandy, was among 14 players bettering par on the 7,351-yard Saddle Rock Golf Course, site of the Open for the first time.

Amateur Michael Glaesel of Arvada, who shared the first-round lead, was tied with amateur Ben McConahey of Littleton and pro Micah Rudosky of Cortez at 140.

Brian Guetz of Littleton, the 1994 Colorado Open champ, was in a group at 141.

Swilor, who has shot rounds of 63 and 64 in this tournament and who was runner-up to champion Chris Endres in 1989, had only one bogey Friday - when he missed the green at the par-4 fourth hole.

Starting on the 10th hole, Swilor made a 10-foot putt to save par, then ran off three straight birdies. He also birdied three straight holes on his back nine, sinking putts of 6, 12 and 70 feet at Nos. 5, 6, and 7.

Swilor called his long-distance birdie putt, from the front of the green over a mound to a left-breaking pin placement, "the longest putt I've made in 10 years, and I know it was the coolest-looking putt I've ever made. It was up a cliff and down another cliff. When it was 10 feet away, I knew it was going in."

Bertsch, 28, who played briefly on the PGA Tour in 1996 and 1997, had a 5-under 31 on his second nine.

The $170,000 tournament, sponsored by First Data Corp., benefits the University of Colorado Cancer Center. The winner will pocket $30,600.