James Stewart, who rides for the San Manuel Yamaha race team, swept both nights of racing to win his third Rockstar Energy Drink U.S. Open tonight inside the MGM Grand Garden Arena and took home $100,000.

GEICO Powersports Honda's Dan Reardon, of Murrieta, Calif., won the holeshot before being passed by Monster Energy/Kawasaki's Ryan Villopoto, of Poulsbo, Wash., later in lap one. Villopoto took advantage of Stewart's poor start and opened up a big lead while Stewart began working his way through the field.

On lap four, Stewart, of Haines City, Fla., quickly passed Reardon and set his sights on Villopoto. Stewart and Villopoto traded positions on lap 10 as Stewart moved into the lead and rode off to the win. Honda Red Bull Racing's Davi Millsaps, of Tallahassee, Fla., passed Reardon for third place on the second to last lap.

"It was a fun race," said Stewart. "I didn't get the start that I wanted but I got the job done. The money is one thing but our team works really hard so this is rewarding for them. I was able to put in some really strong laps after I made my way around (Dan) Reardon."

Chris Alldredge pushed his Yamaha to tonight's moto win in the Alpinestars 85cc Mini Invitational and the overall championship. Alldredge, who finished second last night, opened a big lead over last night's winner Adam Cianciarulo. On the final lap, Cianciarulo pulled up to Alldredge's back wheel, but was unable to pass him.

"I tried to get the best start I could," said Alldredge. "Last year I came into this race and didn't do that well. I learned how to ride the whoops a lot better so I will be more comfortable when I race supercross."

"I got hit off the start and came out almost dead last; it was hard to work through the pack," said Cianciarulo. "I tried my best and tried to make up time where I could. I will be back next year."

Saturday Night Open Class Results
1. James Stewart, Yamaha
2. Ryan Villopoto, Kawasaki
3. Davi Millsaps, Honda
4. Dan Reardon, Honda
5. Michael Byrne, Suzuki
6. Matt Boni, Honda
7. Nick Wey, Yamaha
8. Ezra Lusk, Suzuki
9. Tyler Bowers, Yamaha
10. Chris Blose, Honda

Overall Open Class Results
1. James Stewart, Yamaha, 53
2. Davi Millsaps, Honda, 44
3. Dan Reardon, Honda, 40
4. Ryan Villopoto, Kawasaki, 31
5. Michael Byrne, Suzuki, 27
6. Nick Wey, Yamaha, 27
7. Tyler Bowers, Yamaha, 27
8. Chris Blose, Honda, 26
9. Matt Boni, Honda, 25
10. Matt Georke, Yamaha, 18

Saturday Night Alpinestars 85cc Mini Invitational
1. Chris Alldredege, Yamaha
2. Adam Cianciarulo, Kawasaki
3. Thomas Covington, Kawasaki
4. Colton Ford, KTM
5. Brandan Leith, KTM
6. Keith Tucker, Yamaha
7. Troy Graffunder, Yamaha
8. Cole Heath, Yamaha
9. Jesse Masterpool, Suzuki
10. Daniel Baker, KTM
11. Nick Gaines, Kawasaki
12. Andrew Pierce, Kawasaki

San Manuel Yamaha's James Stewart, of Haines City, Fla., won the opening night of the Rockstar Energy Drink U.S. Open inside the MGM Grand Garden Arena tonight and moved one step closer to cashing in on the $100,000 purse.

Stewart, who is the defending race champion, opened the main event with the holeshot and led all 20 laps en route to the win. GEICO Powersports Honda's Dan Reardon, of Murrieta, Calif., started in second and was passed near the halfway mark by Honda Red Bull Racing's Davi Millsaps, of Tallahassee, Fla.

"I am just happy to get out here and race tonight," said Stewart. "There is a lot of work that I have to do, but the bike worked great tonight. This is always a fun event and I am excited to be a part of it."

Monster Energy/Kawasaki's Ryan Villopoto, of Poulsbo, Wash., suffered a mechanical failure and did not finish the race. Millsaps finished second and Reardon finished third.

"This is an important race for me," said Reardon. "I look forward to tomorrow night's race. I put myself in a great position heading into tomorrow night, so we will see what happens."

"I didn't get the start that I wanted tonight," said Millsaps. "I had a lot of tough guys to pass out there and I am glad to finish well and show the team that I am ready."

Kawasaki's Adam Cianciarulo jumped out to an early lead in the Alpinestars 85cc Mini Invitational and was challenged early by fellow Kawasaki rider Chris Allredege. Cianciarulo began to pull away by lap two and went on to win the main event. Allredege finished second and Jesse Masterpool finished third.

"I have dreamed about racing here my whole life and to win tonight is huge for me," said Cianciarulo. "Every time I hit the finish line jump, the crowd went crazy. I want to thank my family for helping me make this happen."

Racing continues tomorrow night and the 2009 Rockstar Energy Drink U.S. Open champion will be crowned.

Friday Night Open Class Results
1. James Stewart, Yamaha
2. Davi Millsaps, Honda
3. Dan Reardon, Honda
4. Matt Georke, Yamaha
5. Christian Craig, Yamaha
6. Cole Siebler, Honda
7. Tyler Bowers, Yamaha
8. Nick Wey, Yamaha
9. Chris Blose, Honda
10. Michael Byrne, Suzuki

Friday Night Alpinestars 85cc Mini Invitational
1. Adam Cianciarulo, Kawasaki
2. Chris Allredege, Kawasaki
3. Jesse Masterpool, Suzuki
4. Keith Tucker, Yamaha
5. Thomas Covington, Kawasaki
6. Troy Graffunder, Yamaha
7. Colton Ford, KTM
8. Cole Heath, Yamaha
9. Andrew Pierce, Kawasaki
10. Brandan Leith, KTM
11. Nick Gaines, Kawasaki
12. Daniel Baker, KTM