Sean Ian Pierson (born March 10, 1976) is a Canadian mixed martial artist. He currently competes as a Welterweight with the Ultimate Fighting Championship.

Background

Pierson began wrestling in the fourth grade and competed all the way through college, attending Brock University, and was a member of the Canadian National Team for the Greco-Roman and Freestyle categories. Pierson's other accomplishments in the sport include winning multiple national championships in the Greco-Roman category and a Canadian university national freestyle championship. Pierson also trained in judo during high school.

Mixed martial arts career

Bellator Fighting Championship

Pierson was set to compete in Bellator's Second Season Welterweight Tournament but an injury forced him out of the tournament. He was set to have his first fight against Dan Hornbuckle which would have taken place at Bellator 15.

Ultimate Fighting Championship

After TJ Waldburger had to pull out of his fight with Matthew Riddle at UFC 124 due to injury, it was announced on October 27 that Pierson had signed with the UFC to step in on short notice. After outstriking Riddle over three fast paced rounds, Pierson won a unanimous decision (30–27, 30–27, 30–27). The fight was dubbed by Dana White as the real Fight of the Night.