Stephan Bonnar has nine losses against eight opponents on his MMA record. For a list of Bonnar's best fights, refer to "Best fights of Stephan Bonnar".
On November 15, 2014 Stephan Bonnar faced off against Tito Ortiz in a light-heavyweight bout at age 37. He was coming in with a record of 15-9 (10), and Ortiz was 39 years old and with a record of 17-11-1 (11). Bonnar lost the fight via 3-round split decision.
On October 13, 2012 Stephan Bonnar faced off against Anderson Silva in a light-heavyweight bout at age 35. He was coming in with a record of 15-8 (10), and Silva was 37 years old and with a record of 32-4 (25). Bonnar lost the fight via 1st-round TKO.
On February 21, 2010 Stephan Bonnar faced off against Krzysztof Soszynski in a light-heavyweight bout at age 32. He was coming in with a record of 12-7 (9), and Soszynski was 32 years old and with a record of 23-10-1 (20). Bonnar lost the fight via 3rd-round TKO.
On July 11, 2009 Stephan Bonnar faced off against Mark Coleman in a light-heavyweight bout at age 32. He was coming in with a record of 12-6 (9), and Coleman was 44 years old and with a record of 15-9 (12). Bonnar lost the fight via 3-round unanimous decision.
On January 31, 2009 Stephan Bonnar faced off against Jon Jones in a light-heavyweight bout at age 31. He was coming in with a record of 12-5 (9), and Jones was 21 years old and with a record of 7-0 (6). Bonnar lost the fight via 3-round unanimous decision.
On August 26, 2006 Stephan Bonnar faced off against Forrest Griffin in a light-heavyweight bout at age 29. He was coming in with a record of 10-4 (7), and Griffin was 27 years old and with a record of 12-3 (9). Bonnar lost the fight via 3-round unanimous decision.
On June 28, 2006 Stephan Bonnar faced off against Rashad Evans in a light-heavyweight bout at age 29. He was coming in with a record of 10-3 (7), and Evans was 26 years old and with a record of 7-0 (3). Bonnar lost the fight via 3-round majority decision.
On April 9, 2005 Stephan Bonnar faced off against Forrest Griffin in a light-heavyweight bout at age 28. He was coming in with a record of 7-2 (6), and Griffin was 25 years old and with a record of 9-2 (7). Bonnar lost the fight via 3-round unanimous decision.
On September 13, 2003 Stephan Bonnar faced off against Lyoto Machida at age 26. He was coming in with a record of 4-1 (3), and Machida was 25 years old and with a record of 1-0 (0). Bonnar lost the fight via 1st-round TKO.
