Stewart's 12th victory of season clinches series title

SEATTLE -- Kawasaki's James Stewart clinched his first Amp'd Mobile AMA Supercross Series championship and his second Amp'd Mobile World Supercross GP title with his 12th win of the season on Saturday night.

Honda's Davi Millsap finished second. Kevin Windham, also of Honda, finished third.

After clinching the Amp'd Mobile Western Regional AMA Supercross Lites championship prior to the race, Kawasaki's Ryan Villopoto closed out the series with his seventh win.