And one man dominated the Open Class – Yoshimura Suzuki’s James Stewart. The two-time AMA Supercross Champion won every race of his class held under 105-degree temps (F) in southern California.Stewart not only took the inaugural Red Bull Straight Rhythm win, he also took the debut victory of the 2015 Yoshimura Suzuki RM-Z 450. Thirty-two riders began the course. Stewart first beat his brother Malcolm Smith (Honda CRF450R) and then went head-to-head with Justin Brayton (BTO Sports KTM).“This was an awesome event,” Stewart said. “I was able to qualify first on the Yoshimura Suzuki RM-Z50. It was definitely nice to be able to come out and race, it’s been awhile. I learned a lot about the new 2015 RM-Z, and we were able to get some things figured out between races.“The new bike’s really fast and it was great to get a chance to race it in a unique event like this and to take the overall win. This just makes me more excited about racing Supercross in 2015.” As for Red Bull star Travis Pastrana, he was ousted in the first round to Hansen.Taking the overall win in the 250 class was Red Bull KTM’s Marvin Musquin.