Sean Pierson has six losses against six opponents on his MMA record. For a list of Pierson's best fights, refer to "Best fights of Sean Pierson".
On December 30, 2011 Sean Pierson faced off against Dong Hyun Kim in a welterweight bout at age 35. He was coming in with a record of 11-6 (10), and Kim was 30 years old and with a record of 14-1-1 (7). Pierson lost the fight via 3-round unanimous decision.
On April 30, 2011 Sean Pierson faced off against Jake Ellenberger in a welterweight bout at age 35. He was coming in with a record of 11-5 (10), and Ellenberger was 26 years old and with a record of 24-5 (20). Pierson lost the fight via 1st-round KO.
On July 21, 2007 Sean Pierson faced off against Jesse Bongfeldt in a welterweight bout at age 31. He was coming in with a record of 5-4 (5). Pierson lost the fight via 2nd-round TKO.
On September 6, 2003 Sean Pierson faced off against Steve Vigneault in a welterweight bout at age 27. He was coming in with a record of 4-3 (4). Pierson lost the fight via 3-round unanimous decision.
On January 25, 2002 Sean Pierson faced off against John Alessio in a welterweight bout at age 25. He was coming in with a record of 3-2 (3), and Alessio was 22 years old and with a record of 8-5 (6). Pierson lost the fight via 2nd-round KO.
On June 14, 2000 Sean Pierson faced off against Chad Saunders in a welterweight bout at age 24. He was coming in with a record of 2-1 (2). Pierson lost the fight via 1st-round submission.
