The 10th round of the 2011 AMA Motocross Championship presented in Southwick signified a memorable day for Australian Brett Metcalfe (Suzuki), who broke through for his first career victory.

At the start of the first 450 Class event, Ryan Dungey (Suzuki) grabbed the holeshot and lead all 17 laps of competition. The strong start put Dungey in position for his third win in four races, in addition to closing in on series' leader Ryan Villopoto (Kawasaki).

As the bikes lined up on the gates for Moto 2, Dungey's Suzuki was nowhere to be found, still sitting in the pits. His crew worked feverishly as Dungey was forced to watch his competitors start without him. Moments later, the ace rider took to the track but nearly a full lap behind.

Out front, American Honda's Justin Barcia moved into the lead early. Behind him, Metcalfe, Villopoto, and Muscle Milk/Toyota/JGR's Justin Brayton battled for the remaining podium spots.

Barcia rode convincingly to his first moto win in the 450 Class, while Metcalfe's runner-up effort in the moto solidified his position atop the overall standings for the day, on the heels of 3-2 results.

Villopoto's fourth-place effort in Moto2, combined with his second-place finish in the 1st event, landed him second overall. With the win out of his grasp, Dungey battled through the field in tricky conditions to fight his way to seventh in the moto, and third overall (1-7).

Villopoto gained just one point on his rival, and enters the penultimate round of the season next weekend with an eight-point lead. Chad Reed (Honda) was the biggest loser of the day; failing to score any points on the day.

AMA Pro Motocross Championship - Southwick Results

450 Class (Moto Finish)
Pos. Rider Bike
1. Brett Metcalfe Suzuki (3-2)
2. Ryan Villopoto Kawasaki (2-4)
3. Ryan Dungey Suzuki (1-7)
4. Justin Brayton Yamaha (7-3)
5. Mike Alessi KTM (4-6)
6. Jake Weimer Kawasaki (6-5)
7. Justin Barcia Honda (36-1)
8. John Dowd Kawasaki (9-8)
9 .Les Smith Yamaha (8-9)
10. Kyle Chisholm Yamaha (11-10)

AMA Motocross 450 Class Championship Standings
Pos. Rider Bike Points
1. Ryan Villopoto Kawasaki - 431
2. Ryan Dungey Suzuki - 423
3. Chad Reed Honda - 366
4. Brett Metcalfe Suzuki - 304
5. Mike Alessi KTM - 243