Tributo al primo campione del 2008, il giovane Trey Canard che ha tenuto saldi i nervi, ha vinto a St.Louis e così ha battuto Ryan Villopoto che si era rimesso in corsa per il titolo. Nella 450 Chad Reed fa un solo turno di prove, chiude quinto in classifica, parte al comando e si limita a controllare Windham concedendogli solo 3 punti. A due gare dalla fine il pilota del San Manuel conserva 13 punti di vantaggio sul pilota Honda.
Supercross 450
| 1 | 14 | Kevin W. Windham | Centreville, MS | Honda CRF450R | 20 | — | |
| 2 | 22 | Chad Reed | Tampa, FL | Yamaha YZ450F | 20 | 7.765 | |
| 3 | 29 | Andrew T. Short | Smithville, TX | Honda CRF450R | 20 | 16.083 | |
| 4 | 25 | Nathan Ramsey | Menifee, CA | Yamaha YZ450F | 20 | 22.079 | |
| 5 | 32 | Thomas K. Hahn | Alvord, TX | Kawasaki KX450F | 20 | 26.788 | |
| 6 | 118 | David D. Millsaps | Tallahassee, FL | Honda CRF450R | 20 | 31.473 | |
| 7 | 114 | Justin D. Brayton | Murrieta, CA | KTM 450SX | 20 | 37.787 | |
| 8 | 42 | Paul P. Carpenter | Ithaca, NY | Honda CRF450R | 20 | 42.197 | |
| 9 | 11 | Travis A. Preston | Hesperia, CA | Kawasaki KX450F | 20 | 51.429 | |
| 10 | 37 | Jason W. Thomas | Melrose, FL | Honda CRF450R | 20 | 66.715 | |
| 11 | 27 | Nicholas A. Wey | Dewitt, MI | KTM 450SX | 19 | — | |
| 12 | 12 | David Vuillemin | Murrieta, CA | Suzuki RM-Z450 | 19 | — | |
| 13 | 13 | Heath D. Voss | Mico, TX | Honda CRF450R | 19 | — | |
| 14 | 917 | Eric Sorby | Lake Elsinore, CA | Honda CRF450R | 19 | — | |
| 15 | 256 | Bryan K. Johnson | Cairo, GA | Honda CRF450R | 19 | — | |
| 16 | 40 | Joshua R. Hill | Yoncalla, OR | Yamaha YZ450F | 19 | — | |
| 17 | 43 | Jeff Gibson | Blacklick, OH | Kawasaki KX450F | 19 | — | |
| 18 | 72 | Kevin W. Johnson | Albuquerque, NM | Yamaha YZ450F | 19 | — | |
| 19 | 44 | Troy K. Adams | Homosassa, FL | Honda CRF450R | 18 | — | |
| 20 | 107 | Kelly D. Smith | Ludington, MI | Kawasaki KX450F | 0-DNF | — | |
| 21 | 15 | Timmy M. Ferry | Largo, FL | Kawasaki KX450F | 0-DNF | — |
Supercross 250
| 1 | 48 | Trey G. Canard | Elk City, OK | Honda CRF250R | 15 | — | |
| 2 | 77 | Branden L. Jesseman | New Brighton, PA | Kawasaki KX250F | 15 | 2.371 | |
| 3 | 20 | Joshua M. Grant | Riverside, CA | Honda CRF250R | 15 | 13.751 | |
| 4 | 2 | Ryan D. Villopoto | Poulsbo, WA | Kawasaki KX250F | 15 | 17.937 | |
| 5 | 116 | Ryan Morais | Murrieta, CA | Yamaha YZ250F | 15 | 24.791 | |
| 6 | 36 | Kyle P. Chisholm | Seminole, FL | Kawasaki KX250F | 15 | 39.469 | |
| 7 | 57 | Ryan Sipes | Vine Grove, KY | KTM 250SXF | 15 | 39.716 | |
| 8 | 341 | Nico A. Izzi | Saint Clair, MI | Suzuki RM-Z250 | 15 | 48.289 | |
| 9 | 41 | Matthew C. Goerke | Lake Helen, FL | KTM 250SXF | 15 | 50.683 | |
| 10 | 195 | Billy R. Payne | Simi Valley, CA | Honda CRF250R | 15 | 53.273 | |
| 11 | 391 | Tyler T. Bowers | Danville, KY | Yamaha YZ250F | 15 | 66.623 | |
| 12 | 927 | Travis L. Sewell | Westville, IN | Suzuki RM-Z250 | 14 | — | |
| 13 | 95 | Kyle Partridge | Menifee, CA | Honda CRF250R | 14 | — | |
| 14 | 702 | Jimmy Albertson | Ozark, MO | Suzuki RM-Z250 | 14 | — | |
| 15 | 79 | Justin M. Sipes | Vine Grove, KY | Suzuki RM-Z250 | 14 | — | |
| 16 | 75 | Ricky L. Renner | Mulberry, FL | Kawasaki KX250F | 14 | — | |
| 17 | 412 | Levi W. Kilbarger | Logan, OH | Honda CRF250R | 14 | — | |
| 18 | 737 | Tanner J. Reidman | Bismarck, ND | Suzuki RM-Z250 | 14 | — | |
| 19 | 677 | Jason R. Hussey | Moscow Mills, MO | Honda CRF250R | 13 | — | |
| 20 | 71 | Kyle D. Keylon | Brooksville, FL | Honda CRF250R | 13 | — | |
| 21 | 371 | Bruce L. Dehn | Dayton, MN | Kawasaki KX250F | 13 | — | |
| 22 | 979 | Ben Coisy | Manosque, | Honda CRF250R | 12 | — |
