Here are the results and reports of the racing teams for the opening round of the AMA Motocross Championship Series - Hangtown Motocross Classic - in Sacramento (USA).

In what was dubbed the most anticipated race ever, Suzuki’s Ricky Carmichael (Suzuki) won his fifth Amp’d Mobile AMA Supercross Series race in front of 39,506 fans at Sam Boyd Stadium. James Stewart (Kawasaki) won tonight’s race and his first-ever Amp’d Mobile World Supercross GP.

James Stewart (Kawasaki) overcame a rain-drenched track to win the Amp’d Mobile World Supercross GP/Amp’d Mobile AMA Supercross Series main event before a crowd of 46,896 at Qwest Field. Kawasaki’s Grant Langston won the Western Regional AMA Supercross Lites championship and the main event.

Yamaha’s Chad Reed picked up a pivotal win tonight before a crowd of 45,445 at Texas Stadium, tightening the point standings with two rounds remaining in the Amp’d Mobile World Supercross GP/Amp’d Mobile AMA Supercross Series. Kawasaki’s Ryan Villopoto won the AMA Supercross Lites main event.

Kawasaki's James Stewart, of Haines City, Fla., won his eighth Amp'd Mobile World Supercross GP/Amp'd Mobile AMA Supercross Series race at Reliant Stadium in front of 47,389 fans. The win tied Stewart with Suzuki's Ricky Carmichael, of Tallahassee, Fla., for the Amp'd Mobile World Supercross GP championship. Honda's Davi Millsaps, of Cairo, Ga., won his first Eastern Regional AMA Supercross Lites championship and led 13 of 15 laps in the main event.