Monster Energy/Yamalube/Star/Yamaha Racing was down to one rider at the last Western Region round, before the break, in San Diego. Mitchell Oldenburg had injured himself in Oakland, which prevented him from racing and the rookie, Justin Cooper, has been out since the second round. The red plate holder, Aaron Plessinger, finished third in the first heat. He started out tenth in the main then began charging through the field. He was working on a pass for fourth when he crashed in the whoops. With little time remaining, he was unable to make many passes. He ended the night with an eighth-place finish.