Fighters

First Last Nickname Ht. Wt. Reach Stance W L D Belt
Jake O'Brien Irish 6' 3" 205 lbs. 76.0" Orthodox 15 4 0
TJ O'Brien The Spider 6' 2" 155 lbs. -- Orthodox 20 8 0
Sean O'Connell The Real OC 6' 1" 205 lbs. 74.0" Orthodox 17 9 0
Dan O'Connor Johnny Irish 5' 4" 115 lbs. -- 6 6 0
Sean O'Haire 6' 5" 270 lbs. -- Orthodox 4 2 0
Sean O'Malley Suga 5' 11" 135 lbs. 72.0" Switch 18 1 0
Jeremiah O'Neal 5' 8" 260 lbs. -- 13 25 0
Chuck O'Neil Cold Steel 6' 2" 170 lbs. -- 17 9 0
Casey O'Neill King 5' 6" 125 lbs. 69.0" Orthodox 9 2 0
Brendan O'Reilly Badger 5' 7" 170 lbs. 69.0" Orthodox 6 3 0
Takahiro Oba 5' 8" 200 lbs. -- Southpaw 5 7 1
Nobuhiro Obiya 5' 8" 145 lbs. -- Orthodox 12 5 1
Jose Ochoa Kalzifer -- 125 lbs. -- 7 0 0
Christian Ocon 5' 8" 135 lbs. 69.0" Orthodox 2 1 0
Richard Odoms The Black Eagle 6' 5" 265 lbs. -- Orthodox 13 3 0
Volkan Oezdemir No Time 6' 2" 205 lbs. 75.0" Orthodox 20 7 0
Naoya Ogawa 6' 4" 255 lbs. -- Orthodox 7 2 0
Trey Ogden Shamurai 5' 11" 155 lbs. 72.0" Orthodox 17 6 0
Andy Ogle The Little Axe 5' 8" 145 lbs. 69.0" Orthodox 9 6 0
Ho Taek Oh Spider -- 155 lbs. -- 7 2 1
Michiyoshi Ohara 5' 10" 205 lbs. -- Orthodox 0 2 0
Koji Oishi 5' 8" 170 lbs. -- Orthodox 25 10 10
Takayuki Okada Giant Ochiai 6' 1" 290 lbs. -- Orthodox 3 3 2
Yushin Okami Thunder 6' 2" 170 lbs. 75.0" Southpaw 34 12 0
JJ Okanovich The Bosnian Bomber 5' 11" 155 lbs. 76.0" Orthodox 7 1 0
Bolaji Oki The Zulu Warrior 5' 10" 155 lbs. 73.0" Orthodox 9 1 0
Kazuki Okubo 5' 11" 175 lbs. -- Orthodox 7 9 0
Masakatsu Okuda -- -- -- 8 5 0
Aleksei Oleinik The Boa Constrictor 6' 2" 240 lbs. 80.0" Orthodox 60 17 1
Michal Oleksiejczuk Hussar 6' 0" 185 lbs. 74.0" Southpaw 19 8 0
Rafaello Oliveira Tractor 5' 8" 155 lbs. 71.0" Orthodox 17 8 0
Charles Oliveira Do Bronxs 5' 10" 155 lbs. 74.0" Orthodox 34 10 0
Jorge Oliveira 6' 1" 205 lbs. -- 5 3 1
Ednaldo Oliveira Lula 6' 5" 205 lbs. -- Orthodox 17 3 1
Alex Oliveira Cowboy 5' 11" 170 lbs. 76.0" Orthodox 22 12 1
Maria Oliveira Spider-Girl 5' 6" 115 lbs. 69.0" Orthodox 13 7 0
Bruno Oliveira 6' 4" 205 lbs. 80.0" Orthodox 8 2 0
Saimon Oliveira 5' 4" 135 lbs. 72.0" Orthodox 18 5 0
Vinicius Oliveira LokDog 5' 9" 135 lbs. 70.0" Switch 20 3 0
Ravena Oliveira Kenoudy 5' 5" 115 lbs. 65.0" Orthodox 7 2 1
Wendell Oliveira Marques The Machine 5' 10" 170 lbs. -- Orthodox 29 10 0
Felipe Olivieri 5' 9" 155 lbs. -- Orthodox 14 5 0
Andy Ologun 6' 0" 154 lbs. -- Orthodox 3 1 0
Shana Olsen Rock Solid 5' 7" 145 lbs. -- 5 2 0
Casey Olson The Underdog 5' 7" 145 lbs. -- Orthodox 14 5 0
Dennis Olson 6' 0" 170 lbs. -- 14 11 0
Cameron Olson Cap'n Crunch 6' 1" 205 lbs. 75.0" Orthodox 7 3 0
Gadzhi Omargadzhiev 6' 1" 170 lbs. 71.0" Switch 13 2 0
Alan Omer 5' 10" 145 lbs. -- Orthodox 20 5 0
Daniel Omielanczuk 6' 0" 247 lbs. 74.0" Southpaw 19 8 1
Michihiro Omigawa 5' 6" 145 lbs. 68.0" Orthodox 17 14 1
David Onama 5' 11" 145 lbs. 74.0" Orthodox 12 2 0
Charlie Ontiveros American Bad Boy 6' 2" 155 lbs. 74.0" Switch 11 9 0
Chibwikem Onyenegecha 6' 3" 185 lbs. -- Orthodox 5 0 0
Myktybek Orolbai 5' 10" 155 lbs. 74.0" Orthodox 13 1 1
Sam Oropeza 6' 2" 170 lbs. -- 13 3 0
Brian Ortega T-City 5' 8" 145 lbs. 69.0" Switch 16 3 0
Tito Ortiz The People's Champ 6' 3" 205 lbs. 74.0" Orthodox 19 12 1
Jorge Ortiz The Naked Man 6' 0" 185 lbs. -- Orthodox 18 9 1
Dustin Ortiz 5' 5" 125 lbs. 65.0" Orthodox 19 8 0
Kenji Osawa 5' 7" 135 lbs. 66.0" Orthodox 20 11 2
Ode Osbourne The Jamaican Sensation 5' 7" 125 lbs. 73.0" Southpaw 12 7 0
Kurt Osiander -- 185 lbs. -- 4 1 0
Nick Osipczak 6' 2" 170 lbs. 76.0" Orthodox 6 3 0
Nissen Osterneck 6' 2" 185 lbs. -- Orthodox 12 4 0
Rachael Ostovich 5' 3" 125 lbs. 62.0" Orthodox 4 6 0
Pedro Otavio Te Pedro 6' 3" 245 lbs. -- Orthodox 19 8 0
Alexander Otsuka The Diet Butcher 6' 1" 205 lbs. -- Orthodox 5 13 0
Takafumi Otsuka 5' 6" 139 lbs. -- Orthodox 22 13 2
Quemuel Ottoni -- 170 lbs. -- 12 3 0
Zak Ottow The Barbarian 5' 11" 170 lbs. 72.0" Orthodox 17 7 0
Artur Oumakhanov 5' 7" 154 lbs. -- Orthodox 9 6 0
Sidney Outlaw 5' 8" 170 lbs. 74.0" Orthodox 8 4 0
Alistair Overeem The Demolition Man 6' 4" 265 lbs. 80.0" Orthodox 47 19 0
Valentijn Overeem 6' 3" 230 lbs. -- Orthodox 30 32 0
Craig Oxley 5' 9" 155 lbs. -- 0 3 0
Shungo Oyama 5' 11" 185 lbs. -- Southpaw 14 19 0
Ren Ozaki 5' 7" 135 lbs. 68.0" Orthodox 6 1 2
Alptekin Ozkilic The Turkish Delight 5' 5" 125 lbs. 65.0" Orthodox 9 5 0