Yoon Dong-sik has 10 losses against 10 opponents on his MMA record. For a list of Dong-sik's best fights, refer to "Best fights of Yoon Dong-sik".
On September 23, 2017 Yoon Dong-sik faced off against Ikuhisa Minowa in a middleweight bout at age 45. He was coming in with a record of 9-10 (5). Dong-sik lost the fight via 2nd-round TKO.
On May 14, 2016 Yoon Dong-sik faced off against Young Choi in a middleweight bout at age 43. He was coming in with a record of 9-9 (5). Dong-sik lost the fight via 2nd-round KO.
On July 26, 2014 Yoon Dong-sik faced off against Riki Fukuda in a middleweight bout at age 41. He was coming in with a record of 7-8 (5). Dong-sik lost the fight via 1st-round TKO.
On July 20, 2009 Yoon Dong-sik faced off against Jesse Taylor in a middleweight bout at age 36. He was coming in with a record of 4-7 (3), and Taylor was 26 years old and with a record of 12-3 (9). Dong-sik lost the fight via 1st-round TKO.
On September 23, 2008 Yoon Dong-sik faced off against Andrews Nakahara in a middleweight bout at age 36. He was coming in with a record of 4-6 (3). Dong-sik lost the fight via 2nd-round TKO.
On June 15, 2008 Yoon Dong-sik faced off against Gegard Mousasi in a middleweight bout at age 35. He was coming in with a record of 4-5 (3), and Mousasi was 22 years old and with a record of 21-2-1 (20). Dong-sik lost the fight via 2-round unanimous decision.
On November 5, 2006 Yoon Dong-sik faced off against Murilo Bustamante in a welterweight bout at age 34. He was coming in with a record of 0-4 (0). Dong-sik lost the fight via 2-round unanimous decision.
On February 26, 2006 Yoon Dong-sik faced off against Quinton Jackson in a middleweight bout at age 33. He was coming in with a record of 0-3 (0), and Jackson was 27 years old and with a record of 23-6 (18). Dong-sik lost the fight via 3-round unanimous decision.
On October 23, 2005 Yoon Dong-sik faced off against Makoto Takimoto in a middleweight bout at age 33. He was coming in with a record of 0-2 (0). Dong-sik lost the fight via 3-round unanimous decision.
On April 23, 2005 Yoon Dong-sik faced off against Kazushi Sakuraba in a middleweight bout at age 32. He was coming in with a record of 0-1 (0), and Sakuraba was 35 years old and with a record of 16-8-1 (11). Dong-sik lost the fight via 1st-round TKO.