Oban Elliott
“The Welsh Gangster”
12-5-0 · 6'0" · 72" reach
Ode Osbourne
“The Jamaican Sensation”
13-10-0 (1 NC) · 5'7" · 73" reach
Oleg Taktarov
“The Russian Bear”
17-5-2 · 6'0" · — reach
Oli Thompson
17-10-0 · 6'1" · 75" reach
Oliver Enkamp
7-2-0 · 6'0" · 77" reach
Olivier Aubin-Mercier
“The Canadian Gangster”
11-5-0 · 5'9" · 70" reach
Olivier Murad
“Warrior of God”
7-1-0 · 5'10" · 72" reach
Ollie Schmid
“The Hungarian Stallion”
4-3-0 · 5'11" · 71" reach
Oluwale Bamgbose
“Holy War Angel”
6-4-0 · 5'11" · 78" reach
Omar Morales
“Venezuelan Fighter”
11-4-0 · 5'11" · 73" reach
Omari Akhmedov
“Wolverine”
21-6-1 · 6'0" · 73" reach
Onassis Parungao
2-1-0 · 5'11" · — reach
Orion Cosce
“Galaxy”
8-2-0 · 5'11" · 71" reach
Orlando Wiet
“The Gladiator”
1-5-0 · 5'10" · — reach
Oron Kahlon
“The Phenom”
16-2-0 · 5'8" · 70" reach
Oscar Cota
“Elevation”
11-3-0 · 6'2" · 72" reach
Oscar Ravello
“The Punisher”
13-4-1 · 5'10" · — reach
Oskar Piechota
“Imadlo”
11-3-1 (1 NC) · 6'0" · 76" reach
Otari Tanzilovi
11-2-0 · 5'9" · 70" reach
Otgonbaatar Boldbaatar
“Conqueror”
6-1-0 · 5'6" · — reach
Ottman Azaitar
“Bulldozer”
13-3-0 · 5'8" · 71" reach
Oumar Sy
12-3-0 · 6'4" · 83" reach
Ovince Saint Preux
27-18-0 · 6'3" · 80" reach
Ozzy Diaz
“One Hit”
10-5-0 · 6'4" · 79" reach
Ozzy Martin
“Toro”
0-0-0 · 6'0" · — reach