Bellator 231: Mir vs. Nelson 2 was held at the Mohegan Sun Arena in Uncasville, Connecticut on the 25th of October 2019.
The event was headlined by a high octane heavyweight bout with former UFC heavyweight champion Frank Mir go toe to toe with Roy Nelson, in a rematch of their closely contested fight at UFC 130 where Mir clinched the victory via unanimous decision.
Bellator 231 Fight Card
MAIN CARD
| Weight Classes | Fight Card | Method | Round |
| Heavyweight | Anthony Garrett vs Jake Hager | No Contest (groin strike) | R3 (05:00) |
| Heavyweight | Frank Mir def. Roy Nelson | Unanimous Decision | R3 (05:00) |
| Light Heavyweight | Phil Davis def. Karl Albrektsson | TKO (punches) | R3 (05:00) |
| Women's Flyweight | Ilara Joanne def. Bec Rawlings | Submission (kneebar) | R3 (05:00) |
| Welterweight | Ed Ruth def. Jason Jackson | Split Decision | R3 (05:00) |
UNDERCARD
| Weight Classes | Fight Card | Method | Round |
| Light Heavyweight | Dalton Rosta def. Claude Wilcox | TKO (punches) | R3 (04:22) |
| Middleweight | Tim Caron def. Lucas Borges | Unanimous Decision | R3 (05:00) |
| Flyweight | Phumi Nkuta def. Adrian Haly | Unanimous Decision | R3 (05:00) |
| Heavyweight | Steve Mowry def. Gokhan Saricam | Submission (kimura) | R2 (00:56) |
| Welterweight | Jonathan Manley def. Thiago Oliveira | Unanimous Decision | R3 (05:00) |
| Welterweight | Connor Dixon vs. Orkhan Ismatzade | Submission (kimura) | R1 (00:42) |
| Women's Featherweight | Jessy Miele def. Talita Nogueira | Split Decision | R3 (05:00) |
| Women's Atomweight | Elise Reed def. Rebecca Bryggman | TKO (punches) | R1 (04:48) |
| Lightweight | Killys Mota vs. Mandel Nallo | TKO (injury) | R3 (01:16) |
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