BLAINE, Minn. (AP) _ Mike McCullough made five putts of 40 feet or longer en route to a 6-under 66 and a two-stroke lead over Hale Irwin on Friday in the 3M Senior Championship.

McCullough, seeking his third victory of the year, had eight birdies and two bogeys on the TPC of the Twin Cities.

He birdied Nos. 11, 13 and 14 _ holing a 40-footer on the 14th _ to take the lead and added a 12-foot birdie putt on No. 18 for the two-stroke advantage.

McCullough won the Mexico Senior Classic in February for his first victory in six seasons on the senior tour, added the Emerald Coast Classic title in March, and was second in The Tradition in April. He has three top-six finishes in his last four starts.

Irwin, the winner in 1997 and 1999 at Bunker Hills in Coon Rapids, had six birdies in his 68. He got to 3 under, but fell back with bogeys on Nos. 8 and 9. He made a 10-foot par putt on 10, then birdied Nos. 11, 14 and 15 _ with putts of 20, 40 and 6 feet.

Rex Caldwell, Doug Tewell, John Jacobs and Ted Goin opened with 69s, and Allen Doyle and Tom Kite topped an eight-player group at 70.

Doyle, a two-time winner this year who leads the money list with $1,981,502, lost a chance to move closer when he missed 3-foot birdie putt on No. 15 and bogeyed No. 16. Kite made four consecutive birdies on the front nine to reach 4 under, but bogeyed Nos. 11 and 17.