Submission Underground 11 took place Sunday, February 23, 2020 with 3 fights at Roseland Theater in Portland, Oregon.
Submission Underground 10 took place Sunday, December 22, 2019 with 8 fights at Roseland Theater in Portland, Oregon.
Frank Rosenthal is a Brazilian jiu-jitsu black belt under Doug Pelinkovic, who also worked extensively with John Danaher and Carl Massaro, being a product of the Renzo Gracie Academy network. Rosenthal made his name while competing in the no-gi, submission-only competitive circuit where he conquered well-respected events such as the RISE and Onnit Invitational tournaments.
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