AMA Motocross Championship
Alessi's debut season in the Supercross Class seemed promising as he was fourth place in the championship points race after five of seventeen rounds. His season was cut short in San Diego during the sixth round of the 2008 Monster Energy AMA Supercross Championship. During the second practice session, Alessi crashed in the whoops section of the track resulting in a broken collarbone. After a seven-week recovery, Alessi decided to sit out the remainder of the 2008 Supercross season in order to prepare for the upcoming 2008 AMA Motocross Championship.