Willie Peeters has 10 losses against nine opponents on his MMA record. For a list of Peeters's best fights, refer to "Best fights of Willie Peeters".
On June 4, 2000 Willie Peeters faced off against Heath Herring at age 34. He was coming in with a record of 9-10-1 (7), and Herring was 22 years old and with a record of 13-5 (12). Peeters lost the fight via 1st-round submission.
On August 19, 1999 Willie Peeters faced off against Chris Haseman at age 33. He was coming in with a record of 8-9 (6), and Haseman was 30 years old and with a record of 7-5 (6). Peeters lost the fight via 1st-round submission.
On July 1, 1999 Willie Peeters faced off against Antonio Carlos Ribeiro at age 33. He was coming in with a record of 8-8 (6). Peeters lost the fight via 1st-round TKO.
On June 24, 1999 Willie Peeters faced off against Ryuki Ueyama at age 33. He was coming in with a record of 8-7 (6), and Ueyama was 23 years old and with a record of 1-2 (1). Peeters lost the fight via 3rd-round TKO.
On June 27, 1998 Willie Peeters faced off against Wataru Sakata at age 32. He was coming in with a record of 8-6 (6), and Sakata was 25 years old and with a record of 2-4 (2). Peeters lost the fight via 1st-round submission.
On December 23, 1997 Willie Peeters faced off against Sean Alvarez at age 32. He was coming in with a record of 7-5 (6), and Alvarez was 26 years old and with a record of 1-1 (1). Peeters lost the fight via 1-round undefined.
On November 22, 1996 Willie Peeters faced off against Tom Erikson at age 31. He was coming in with a record of 6-4 (5), and Erikson was 32 years old and with a record of 1-0 (1). Peeters lost the fight via 1st-round submission.
On October 25, 1996 Willie Peeters faced off against Mitsuya Nagai at age 30. He was coming in with a record of 5-3 (4), and Nagai was 27 years old and with a record of 12-2 (12). Peeters lost the fight via 2-round undefined.
On February 18, 1996 Willie Peeters faced off against Tsuyoshi Kosaka at age 30. He was coming in with a record of 1-2 (0), and Kosaka was 25 years old and with a record of 5-0 (4). Peeters lost the fight via 2nd-round submission.
On January 24, 1996 Willie Peeters faced off against Chris Haseman at age 30. He was coming in with a record of 1-1 (0), and Haseman was 26 years old and with a record of . Peeters lost the fight via 2-round undefined.