Las Vegas Supercross grand finale on Cinco de Mayo? Count us in! After seventeen grueling rounds of stadium racing, the world’s best Supercross racers lined up for one final showdown in Sin City this weekend. With Adam Cianciarulo winning his first 250SX Main Event of the year in the East/West shootout, three champions crowned, and their first-ever premier 450SX class Supercross title being awarded to Rockstar Energy Racing/Husqvarna via Jason Anderson there was NO shortage of action. Check out the photos!