Jay Hieron has seven losses against seven opponents on his MMA record. For a list of Hieron's best fights, refer to "Best fights of Jay Hieron".
On February 28, 2013 Jay Hieron faced off against Tyron Woodley in a welterweight bout at age 36. He was coming in with a record of 23-7 (11). Hieron lost the fight via 1st-round KO.
On October 5, 2012 Jay Hieron faced off against Jake Ellenberger in a welterweight bout at age 36. He was coming in with a record of 23-6 (11), and Ellenberger was 27 years old and with a record of 27-6 (22). Hieron lost the fight via 3-round unanimous decision.
On October 29, 2011 Jay Hieron fought Ben Askren in a welterweight title fight for Askren's Bellator World Championship title. Hieron was 35 years old and with a record of 22-5 (11), and Askren was 27 years old and with a record of 8-0 (3). Hieron lost the fight via 5-round split decision.
On June 1, 2007 Jay Hieron faced off against Brad Blackburn at age 30. He was coming in with a record of 12-4 (8), and Blackburn was 30 years old and with a record of 13-9-1 (10). Hieron lost the fight via 1st-round KO.
On November 2, 2006 Jay Hieron faced off against Chris Wilson at age 30. He was coming in with a record of 10-3 (6), and Wilson was 29 years old and with a record of 11-4 (11). Hieron lost the fight via 3-round unanimous decision.
On October 3, 2005 Jay Hieron faced off against Jonathan Goulet at age 29. He was coming in with a record of 7-2 (4), and Goulet was 26 years old and with a record of 13-5 (11). Hieron lost the fight via 3rd-round TKO.
On June 19, 2004 Jay Hieron faced off against Georges St-Pierre at age 27. He was coming in with a record of 4-1 (3), and St-Pierre was 23 years old and with a record of 6-0 (5). Hieron lost the fight via 1st-round TKO.
