Heath Sims has four losses against four opponents on his MMA record. For a list of Sims's best fights, refer to "Best fights of Heath Sims".
On February 24, 2006 Heath Sims faced off against John Cronk at age 34. He was coming in with a record of 5-4-2 (4). Sims lost the fight via 1st-round submission.
On February 4, 2005 Heath Sims faced off against Katsuya Inoue at age 33. He was coming in with a record of 4-3-2 (3). Sims lost the fight via 1st-round TKO.
On August 31, 2003 Heath Sims faced off against Yuki Sasaki at age 31. He was coming in with a record of 2-2 (1), and Sasaki was 26 years old and with a record of 13-8-1 (10). Sims lost the fight via 3-round unanimous decision.
On November 9, 2002 Heath Sims faced off against Antonio McKee at age 31. He was coming in with a record of 2-1 (1). Sims lost the fight via 3-round unanimous decision.