Gene Sauers shot a 3-under 68 on Saturday to take a three-stroke lead in the third round of the U.S. Senior Open.
Sauers had a 33 on the back nine to take control at Oak Tree National heading into the final round on Sunday. He is at 7 under for the tournament.
Colin Montgomerie, Bernhard Langer and Scott Dunlap are tied for second at 4 under.
Langer, who has dominated the Champions Tour all season, was solid, but had several potential birdies lip out during his even-par 71.
Marco Dawson, who shot a 76 on Friday, rebounded with a 69 on Saturday and is tied for fifth with Jeff Sluman and Vijay Singh.