Ryan Dungey capped his second straight Monster Energy AMA Supercross championship season with a victory Saturday night in the mud at Sam Boyd Stadium.

The Red Bull KTM factory rider from Minnesota won nine times in the 17-race 450SX season. He wrapped up his third career season title last week with a fourth-place finish in New Jersey.

Suzuki’s Ken Roczen, a five-time winner this year, crashed in the mud with the lead on the sixth of 16 laps, with second-place Dungey clipping his bike and also going down.

Dungey got up first and led the rest of the way. Roczen spent time of the track and ended up 20th. The German rider was second in the season standings, 60 points behind Dungey.

Husqvarna’s Jason Anderson was second in the race, and Kawasaki’s Eli Tomac Cortez finished third.

Kawasaki’s Joey Savatgy won the 12-lap 250SX East/West Shootout, but ended up a point behind Yamaha’s Cooper Webb in the final East Regional standings. Webb was 11th in the race.

Husqvarna’s Zach Osborne was second, and Honda’s Malcolm Stewart finished third to take the West title. Stewart beat Yamaha’s Aaron Plessinger by 16 points. Plessinger was fourth in the race.