CALGARY, Alberta --
Mackenzie, the 33-year-old former University of Washington player from Yakima, Wash., had rounds of 65, 63, 67 and 66 for a four-stroke victory against Joel Dahmen and Stephen Carney.
Brian Unk set the tour record of 28 under in the 2009 Seaforth Country Classic.
"I honestly didn't expect to shoot 27 under at the beginning of the week," Mackenzie said. "On this tour, 16 under's usually a pretty good score. I don't even know if that got in the top 15 this week. I just had to keep the pedal to the metal, as they say, and it went my way."
Mackenzie earned $27,000 to jump to third on the money list with $44,822, with the final top five earning Web.com Tour status next season.
"To be able to play this way, I'm so happy with myself that I was able to execute and do what I did," said Mackenzie, who also the tour's 2010 Bayview Place Island Savings Open. "Winning out here provides a huge step for next year. The perks of winning and what comes with that is even more special."
Dahmen, from Clarkston, Washington, finished with a 64. He leads the money list with $77,778.
Carney closed with a 68.