BLAINE, Minn. (AP) Peter Senior shot a bogey-free 67 and John Huston birdied No. 18 for a 68 on Saturday that left them tied for the lead at 12 under after the second round of the 3M Championship.
Jay Haas, the co-leader after the opening round, shot a 69 and was one shot back.
Mark Calcavecchia (68), who finished second in last year's event, and Minnesota native Tom Lehman (69) were two behind.
Tommy Armour III (67), Mark O'Meara (68), Kenny Perry (70), Nick Price (68) and Hal Sutton (69) trailed by four.
Play was delayed 1 hour, 56 minutes due to rain and lightning when the leaders began their back nine at TPC Twin Cities.
Early in the day, the TPC Twin Cities played much like it did Friday when 53 of 80 players broke par by firing right at the flags. However, the wind began to pick up as the final groups began their rounds around noon, quickly reducing the number of birdies that were being posted. Following the stoppage, the wind was not a factor, and scores began to drop again.
Leading by three shots, Huston hit his tee shot on No. 12 into a water hazard, leading to a bogey. Haas and Lehman birdied the hole to get within one shot. Haas birdied No. 13 to temporarily tie for the lead, but missed a short putt on No. 18 while Huston birdied the final hole.
Senior, who has yet to win since joining the Champions Tour last year, birdied three of the four par-3s. He hit 27 of 28 fairways in the first two rounds, and 33 of 36 greens in regulation.
Calcavecchia had birdies on Nos. 14 and 15 to get within a shot. A bad approach shot on 18 cost him a birdie opportunity. He also missed four putts from within 4 feet during his round, saying he turned a potential 63 into a 68.
Lehman, a three-time winner this year and the season points leader, made three bogeys and said he couldn't get any momentum going.