Dave Jansen has four losses against four opponents on his MMA record. For a list of Jansen's best fights, refer to "Best fights of Dave Jansen".
On May 20, 2016 Dave Jansen faced off against Marcin Held in a lightweight bout at age 36. He was coming in with a record of 20-4 (11), and Held was 24 years old and with a record of 21-4 (16). Jansen lost the fight via 3-round unanimous decision.
On April 10, 2015 Dave Jansen fought Will Brooks in a lightweight title fight for Brooks' Bellator Championship title. Jansen was 35 years old and with a record of 20-3 (11), and Brooks was 28 years old and with a record of 15-1 (9). Jansen lost the fight via 5-round unanimous decision.
On August 18, 2010 Dave Jansen faced off against Ricardo Lamas at age 30. He was coming in with a record of 13-2 (8), and Lamas was 28 years old and with a record of 8-1 (4). Jansen lost the fight via 3-round unanimous decision.
On January 10, 2010 Dave Jansen faced off against Kamal Shalorus at age 30. He was coming in with a record of 13-1 (8), and Shalorus was 32 years old and with a record of 5-0-1 (5). Jansen lost the fight via 3-round unanimous decision.
