Jason Lambert has 13 losses against 13 opponents on his MMA record. For a list of Lambert's best fights, refer to "Best fights of Jason Lambert".
On November 15, 2013 Jason Lambert faced off against Tom DeBlass in a light-heavyweight bout at age 36. He was coming in with a record of 26-13 (22), and DeBlass was 31 years old and with a record of 8-2 (5). Lambert lost the fight via 1st-round KO.
On August 14, 2010 Jason Lambert faced off against Tony Lopez in a light-heavyweight bout at age 32. He was coming in with a record of 25-12 (21). Lambert lost the fight via 2nd-round KO.
On October 24, 2009 Jason Lambert faced off against Matt Horwich in a middleweight bout at age 32. He was coming in with a record of 23-11 (19), and Horwich was 31 years old and with a record of 23-14-1 (21). Lambert lost the fight via 3-round split decision.
On May 16, 2009 Jason Lambert faced off against Vladimir Matyushenko in a middleweight bout at age 31. He was coming in with a record of 23-10 (19), and Matyushenko was 38 years old and with a record of 21-4 (14). Lambert lost the fight via 3-round unanimous decision.
On September 6, 2008 Jason Lambert faced off against Jason MacDonald in a middleweight bout at age 30. He was coming in with a record of 23-9 (19), and MacDonald was 33 years old and with a record of 20-10 (17). Lambert lost the fight via 2nd-round submission.
On June 7, 2008 Jason Lambert faced off against Luiz Cané in a light-heavyweight bout at age 30. He was coming in with a record of 23-8 (19), and Cané was 27 years old and with a record of 8-1 (8). Lambert lost the fight via 1st-round TKO.
On January 19, 2008 Jason Lambert faced off against Wilson Gouveia in a light-heavyweight bout at age 30. He was coming in with a record of 23-7 (19), and Gouveia was 29 years old and with a record of 9-4 (8). Lambert lost the fight via 2nd-round KO.
On September 23, 2006 Jason Lambert faced off against Rashad Evans in a light-heavyweight bout at age 29. He was coming in with a record of 22-6 (18), and Evans was 26 years old and with a record of 8-0 (3). Lambert lost the fight via 2nd-round KO.
On November 13, 2003 Jason Lambert faced off against Chael Sonnen in a light-heavyweight bout at age 26. He was coming in with a record of 14-5 (11), and Sonnen was 26 years old and with a record of 7-2-1 (2). Lambert lost the fight via 3-round unanimous decision.
On November 9, 2002 Jason Lambert faced off against Wesley Correira in a heavyweight bout at age 25. He was coming in with a record of 10-4 (8), and Correira was 23 years old and with a record of 7-4 (6). Lambert lost the fight via 2nd-round KO.
On April 27, 2002 Jason Lambert faced off against Tim Sylvia in a heavyweight bout at age 24. He was coming in with a record of 7-3 (6), and Sylvia was 26 years old and with a record of 10-0 (8). Lambert lost the fight via 2nd-round TKO.
On November 11, 2001 Jason Lambert faced off against Marco Ruas in a heavyweight bout at age 24. He was coming in with a record of 3-2 (3), and Ruas was 40 years old and with a record of 8-3-2 (8). Lambert lost the fight via 1st-round submission.
On September 29, 2001 Jason Lambert faced off against Kim Jong Wang in a heavyweight bout at age 24. He was coming in with a record of 3-1 (3). Lambert lost the fight via 1st-round submission.