The podium was Millsaps' seventh in eight attempts this season and he continues to lead the '13 title fight with a healthy cushion. "It's definitely a slick track. I spun all the way out of the gates. But it was definitely a good race."

WATCH: Millsaps Wins Heat 1

Barcia's teammate, Trey Canard, rounded out the top five, while championship contender Ryan Dungey was an uncharacteristic sixth, halting his recent run of podiums.

Western Regional 250SX title contender Eli Tomac made an impressive premier class debut, racing to seventh, ahead of 450 vets Jake Weimer, Chad Reed, and Mike Alessi.

Millsaps now boasts a 22-point advantage over Villopoto with Dungey relegated to third, 26 points out of first as the series picks back up next weekend in St. Louis.

WATCH: Atlanta Analysis

450SX Class Results: Atlanta

James Stewart, Haines City, Fla., Suzuki
Ryan Villopoto, Poulsbo, Wash., Kawasaki
Davi Millsaps, Murrieta, Calif., Suzuki
Justin Barcia, Ochlocknee, Ga., Honda
Trey Canard, Shawnee, Okla., Honda
Ryan Dungey, Belle Plaine, Minn., KTM
Eli Tomac, Cortez, Colo., Honda
Chad Reed, Australia, Honda
Jake Weimer, Rupert, Idaho, Kawasaki
Mike Alessi, Hilliard, Fla., Suzuki

450SX Class Points

Davi Millsaps, Murrieta, Calif., Suzuki, 174
Ryan Villopoto, Poulsbo, Wash., Kawasaki, 152
Ryan Dungey, Belle Plaine, Minn., KTM, 148
Trey Canard, Shawnee, Okla., Honda, 135
Chad Reed, Australia, Honda, 127
Justin Barcia, Ochlocknee, Ga., Honda, 116
Andrew Short, Smithville, Texas, KTM, 102
James Stewart, Haines City, Fla., Suzuki, 100
Justin Barcia, Ochlocknee, Ga., Honda, 91
Matt Goerke, Lake Helen, Fla., KTM, 79