For the first time in over 750 AMA Supercross rounds, five premier-class champions were on the starting line together. Jett Lawrence and Chase Sexton both won crowns with Honda, and Eli Tomac, Cooper Webb and Jason Anderson are also past champions.

Jett Lawrence is trying to become only the second rider to win back-to-back championships to start his premier-class SX career (Jeremy McGrath won his first four with Honda). To recognize his status as reigning 450SX Champion, Jett ran a red number plate with a fluorescent-yellow number 1 on his CRF450RWE at the opener.

As the reigning SuperMotocross Champion, the Australian will run the yellow digit for the entire series. Check out this cool gallery of the AMA supercross champion.