Oban Elliott

12-5-07 fights

Ode' Osbourne

13-10-014 fights

Oli Thompson

—2 fights

Oliver Enkamp

—2 fights

Olivier Aubin-Mercier

21-5-012 fights

Olivier Murad

7-1-01 fights

Ollie Schmid

4-3-01 fights

Oluwale Bamgbose

6-4-05 fights

Omar Morales

11-4-08 fights

Omari Akhmedov

24-8-115 fights

Opponent TBA

—2 fights

Orion Cosce

8-2-04 fights

Oron Kahlon

16-1-01 fights

Oscar Cota

11-3-01 fights

Oskar Piechota

11-3-16 fights

Otari Tanzilovi

9-1-02 fights

Ottman Azaitar

13-3-05 fights

Oumar Sy

12-2-06 fights

Ovince Saint Preux

27-18-028 fights

Ozzy Diaz

10-4-05 fights