Josh Diekmann has eight losses against seven opponents on his MMA record. For a list of Diekmann's best fights, refer to "Best fights of Josh Diekmann".
On November 4, 2016 Josh Diekmann faced off against Tyler King in a heavyweight bout at age 40. He was coming in with a record of 15-8 (15). Diekmann lost the fight via 2nd-round submission.
On January 8, 2016 Josh Diekmann faced off against Ashley Gooch in a heavyweight bout at age 39. He was coming in with a record of 15-7 (15). Diekmann lost the fight via 1st-round submission.
On February 27, 2015 Josh Diekmann faced off against Raphael Butler in a heavyweight bout at age 38. He was coming in with a record of 15-6 (15), and Butler was 31 years old and with a record of 8-1-1 (8). Diekmann lost the fight via 1st-round submission.
On October 6, 2012 Josh Diekmann faced off against Tyler King in a heavyweight bout at age 35. He was coming in with a record of 12-5 (12). Diekmann lost the fight via 3-round unanimous decision.
On February 3, 2012 Josh Diekmann faced off against Josh Hendricks in a heavyweight bout at age 35. He was coming in with a record of 12-4 (12). Diekmann lost the fight via 1st-round submission.
On November 14, 2009 Josh Diekmann faced off against Christian Morecraft in a heavyweight bout at age 33. He was coming in with a record of 10-3 (10), and Morecraft was 23 years old and with a record of 3-0 (3). Diekmann lost the fight via 1st-round submission.
On September 21, 2007 Josh Diekmann faced off against Chris Guillen in a heavyweight bout at age 30. He was coming in with a record of 9-2 (9). Diekmann lost the fight via 2nd-round submission.
On October 12, 2006 Josh Diekmann faced off against Justin Eilers in a heavyweight bout at age 30. He was coming in with a record of 6-1 (6), and Eilers was 28 years old and with a record of 13-5-1 (13). Diekmann lost the fight via 1st-round TKO.
