The fourth round of the Lucas Oil Pro Motocross Championship took place at Muddy Creek Raceway in Tennessee, with new points leaders entering the day following last week’s shakeups. Ken Roczen continued his resurgence in the 450 Class, but Ryan Dungey still managed to hold serve. In the 250 Class, Jeremy Martin and Marvin Musquin each had a moto win, but a mistake from one of them would make the difference in the fight for the overall victory.