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Takahiro Oba
Japan
1976-08-14
5'8 / 177cm
200 lbs / 91 kg
 
 
Nobuhiro Obiya
Japan
0000-00-00
5'8
145 lbs
 
 
Giant Ochiai
Japan
0000-00-00
6'1 / 185cm
286 lbs / 130 kg
 
 
 
Naoya "O-Chan" Ogawa
Japan
1968-03-31
6'4 / 193cm
253 lbs / 115 kg
 
 
Michiyoshi Ohara
Japan
1967-11-15
5'10 / 178cm
242 lbs / 110 kg
 
 
Yushin Okami
Japan
0000-00-00
6'2 / 188cm
181 lbs / 82 kg
 
 
 
Kazuki Okubo
Japan
0000-00-00
5'11 / 178cm
175 lbs / 79 kg
 
 
Michihiro Omigawa
Japan
1975-12-19
5'5 / 168cm
154 lbs / 70 kg
 
 
Pedro "The Pedro" Otavio
Brazil
1967-12-17
6'3 / 188cm
243 lbs / 110 kg
 
 
 
Alexander Otsuka
Japan
1971-07-17
6'1 / 182cm
203 lbs / 92 kg
 
 
Alistair Overeem
Holland
1980-05-17
6'5 / 194cm
205 lbs / 92.9 kg
 
 
Valentijn Overeem
Holland
1967-08-17
6'3 / 188cm
228 lbs / 103 kg
 
 
 
Shungo Oyama
Japan
1974-04-11
5'11 / 178cm
189 lbs / 86 kg