NASCAR'S oldest driver, Mark Martin, sailed to victory on the last lap of the Sam's Town 300 Nationwide Series event Saturday at Las Vegas Motor Speedway driving a Purolator filters-equipped Chevrolet Impala. Young Brad Keselowski, wheeling a Dodge Charger for Penske Racing, was headed for the apparent win when he cut a tire on the final laps and Martin went by for the victory. It was the fourth win in six Nationwide Series races at LVMS for Martin on Purolator.