Sean O'Connell has 10 losses against 10 opponents on his MMA record. For a list of O'Connell's best fights, refer to "Best fights of Sean O'Connell".
On August 30, 2018 Sean O'Connell faced off against Bozigit Ataev in a light-heavyweight bout at age 34. He was coming in with a record of 18-10 (13), and Ataev was 38 years old and with a record of 17-2 (16). O'Connell lost the fight via 1st-round TKO.
On December 9, 2016 Sean O'Connell faced off against Corey Anderson in a light-heavyweight bout at age 33. He was coming in with a record of 17-9 (12), and Anderson was 27 years old and with a record of 8-2 (3). O'Connell lost the fight via 2nd-round TKO.
On June 18, 2016 Sean O'Connell faced off against Steve Bossé in a light-heavyweight bout at age 32. He was coming in with a record of 17-8 (12), and Bossé was 34 years old and with a record of 11-2 (10). O'Connell lost the fight via 3-round unanimous decision.
On January 17, 2016 Sean O'Connell faced off against Ilir Latifi in a light-heavyweight bout at age 32. He was coming in with a record of 17-7 (12), and Latifi was 32 years old and with a record of 10-4 (8). O'Connell lost the fight via 1st-round KO.
On June 28, 2014 Sean O'Connell faced off against Gian Villante in a light-heavyweight bout at age 30. He was coming in with a record of 15-6 (10), and Villante was 28 years old and with a record of 11-5 (9). O'Connell lost the fight via 3-round split decision.
On April 16, 2014 Sean O'Connell faced off against Ryan Jimmo in a light-heavyweight bout at age 30. He was coming in with a record of 15-5 (10), and Jimmo was 32 years old and with a record of 18-3 (9). O'Connell lost the fight via 1st-round KO.
On November 12, 2010 Sean O'Connell faced off against Joseph Henle at age 27. He was coming in with a record of 9-4 (6). O'Connell lost the fight via 2nd-round submission.
On February 20, 2009 Sean O'Connell faced off against Jordan Smith at age 25. He was coming in with a record of 7-3 (5), and Smith was 24 years old and with a record of 9-0 (8). O'Connell lost the fight via 1st-round submission.
On April 5, 2008 Sean O'Connell faced off against Hank Weiss at age 24. He was coming in with a record of 6-2 (5). O'Connell lost the fight via 2nd-round KO.
On July 14, 2007 Sean O'Connell faced off against Kevin Hill at age 23. He was coming in with a record of 3-1 (3). O'Connell lost the fight via 1st-round TKO.