Submission Underground 28 took place Sunday, October 31, 2021 with 10 fights in Portland, Oregon.

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Main Cast: Andy Varela, Haisam Rida, Aaron Tiegs, Guilherme Vasconcelos, Cris Lencioni, Kevin Lee, Juliana Miller, Tara LaRosa, Kyle Chambers, Tanner Weisgram

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