Submission Underground 18 took place Sunday, October 4, 2020 with 10 fights in Portland, Oregon.

Submission Underground 16 took place Sunday, July 12, 2020 with 10 fights in Portland, Oregon.

Submission Underground 15 took place Sunday, June 21, 2020 with 9 fights in Portland, Oregon.

Mason Fowler will be defending his belt for the third time against Bellator heavyweight champion and former light heavyweight champion Ryan Bader. A former NCAA wrestling standout, Bader presents a different challenge than previous defenses. Also on the card, Craig Jones will face Vinny Magalhaes, who are both decorated Brazilian Jiu-Jitsu practitioners, along with former judo Olympic gold medalist Satoshi Ishii. Fowler won all of his previous defenses in the overtime ruleset.