Source: Supplied.

Ken Roczen claimed his second 450SX main event victory of the 2017 Monster Energy AMA Supercross Championship inside San Diego’s Petco Park on 14 January.

It was defending champion, Ryan Dungey, who took the early lead aboard his Red Bull KTM as Roczen, aboard his Team Honda HRC entry, shadowed the multi-time champion applying ample amounts of pressure.

Eventually it was Roczen who claimed the race lead at the mid-point of the 20-minute plus one lap race, but Dungey made certain to latch onto the rear fender of the points leader right to the very end.

A small mistake from Dungey on the final lap allowed Roczen to cruise to back-to-back wins and continue his perfect season to date aboard his all-new 2017 Honda CRF450R.

Behind Roczen and Dungey it was Red Bull KTM’s Marvin Musquin who finished a distant third to mark his second third place finish of the 2017 season.

Rockstar Energy Husqvarna Factory Racing’s Jason Anderson crossed the line in fourth position for the second week in a row, followed by Team Honda HRC’s Cole Seely to round out the top five.

Australia’s Chad Reed finished the night in ninth position after starting the main event buried in the field aboard his factory Yamaha YZ450F.

Roczen now leads the 450SX championship chase by six points over Dungey with French rider, Musquin, sitting a further four points behind his factory KTM stablemate.

In the 250SX western regional main event it was GEICO Honda’s Jimmy Decotis who claimed the holeshot and quickly sprinted out to a comfortable early lead ahead of his competitors.

Rockstar Energy Husqvarna Factory Racing’s Martin Davalos held second place early followed by Australia’s Dan Reardon aboard his Yamalube Star Racing Yamaha YZ250F.

The Aussie veteran held a strong pace during the opening laps before a costly mistake saw him sample the San Diego soil and fall out of contention, eventually finishing up in 17th position for the night.

Up front it was Davalos who claimed the lead at the mid-point of the 15-minute plus one lap main event, behind him it was round one winner, Shane McElrath, who also made his way past Decotis and into second position.

After starting in ninth and 10th positions, both Justin Hill and Aaron Plessinger also made their way to the lead group as McElrath found his way around Davalos to take control of the race.

Eventually it was top qualifier Hill, aboard his Monster Energy Pro Circuit Kawasaki, who made his way into second and pushed McElrath all the way to the finish line.

McElrath would hang on to claim his second main event win of both the season and his career, followed by Hill, Plessinger, Davalos and 250SX rookie, Austin Forkner to round out the top five.

Australia’s Hayden Mellross put together a strong main event showing aboard his 51FIFTY Energy Drink Yamaha as he crossed the line in ninth position to wrap up the night.

McElrath continues to lead the 250SX western regional standings holding an eight-point lead over Plessinger followed by Hill in third place a further four points back of the Yamaha-mounted contender.

The 2017 Monster Energy AMA Supercross Championship will now head back to Anaheim’s Angel Stadium for round three of the series on 21 January.