Dawson, playing the back nine first at TPC Twin Cities, birdied three of his first four holes and chipped in for eagle on No. 18. After a birdie on the par-5 third hole, he birdied three of his final four holes.
Langer, the two-time 3M champion who won by a tour-record 13 strokes Sunday at Royal Porthcawl, was tied for second with Jeff Maggert, Rocco Mediate and Vijay Singh. Langer holed out from the fairway for an eagle on the par-4 14th and added birdies on Nos. 16 and 18.
Lone Oak alum Kenny Perry opened with a 65, and Paul Goydos had a 67 in his debut on the 50-and-over tour.
