All Ranked MMA Fighters Whose Last Name Begins with O Help Keep the Site Ad Free By Supporting us at Patreon
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All Ranked MMA Fighters Whose Last Name Begins with O
Notes: Ranking Explanations
| Athlete | Rookie Yr | Overall Rank |
| Nobuhiro Obiya | 2002 | 1345 |
| Jake O'Brien | 2005 | 1848 |
| Haruo Ochi | 2008 | 1834 |
| Sean O'Connell | 2007 | 1956 |
| James O'Connor | 1999 | 1673 |
| Volkan Oezdemir | 2010 | 305 |
| Erik Oganov | 2000 | 1951 |
| Naoya Ogawa | 1997 | 1537 |
| Trey Ogden | 2015 | 2274 |
| Hiromasa Ogikubo | 2006 | 1502 |
| Dom O'Grady | 2007 | 347 |
| Takuya Ogura | 2007 | 899 |
| Juri Ohara | 2009 | 481 |
| Tomonori Ohara | 1990 | 424 |
| Koji Oishi | 2000 | 521 |
| Masahiro Oishi | 1993 | 612 |
| Rae-Yoon Ok | 2013 | 1184 |
| Ryo Okada | 2009 | 482 |
| Yushin Okami | 2002 | 140 |
| Yuki Okano | 2008 | 530 |
| Koetsu Okazaki | 2004 | 363 |
| Mamoru Okochi | 1991 | 517 |
| Taisuke Okuno | 2005 | 533 |
| Michal Oleksiejczuk | 2014 | 1878 |
| Alexey Oleynik | 1997 | 597 |
| Alex Oliveira | 2011 | 1194 |
| Charles Oliveira | 2008 | 47 |
| Daniel Oliveira | 2007 | 2259 |
| Ednaldo Oliveira | 2005 | 2350 |
| Evandro Oliveira | 2001 | 1806 |
| Jorge Oliveira | 2005 | 2020 |
| Vinicius Oliveira | 2015 | 1977 |
| Robbie Oliver | 2002 | 1576 |
| Brandon Olsen | 2002 | 963 |
| Brian Olsen | 2004 | 1451 |
| Sean O'Malley | 2013 | 208 |
| Islam Omarov | 2016 | 1602 |
| Daniel Omielanczuk | 2009 | 2424 |
| Michihiro Omigawa | 2005 | 1260 |
| Michiro Omigawa | 2005 | 1550 |
| David Onama | 2019 | 2041 |
| Myktybek Orolbai | 2018 | 1950 |
| Brian Ortega | 2010 | 163 |
| Dustin Ortiz | 2010 | 2147 |
| Jorge Ortiz | 2002 | 975 |
| Tito Ortiz | 1997 | 14 |
| Sojiro Orui | 2005 | 934 |
| Kenji Osawa | 2003 | 537 |
| Yoshinobu Ota | 1999 | 1840 |
| Pedro Otavio | 1995 | 1420 |
| Rentsen Otgontulga | 2012 | 793 |
| Alexander Otsuka | 1995 | 1285 |
| Takafumi Otsuka | 2006 | 348 |
| Donald Ouimet | 2000 | 1900 |
| Houssain Oushani | 2004 | 940 |
| Sidney Outlaw | 2010 | 1592 |
| Alistair Overeem | 1999 | 64 |
| Valentijn Overeem | 1996 | 756 |
| Alex Owen | 2002 | 2181 |
| Shungo Oyama | 2001 | 1411 |
| Tatsuki Ozaki | 2013 | 2468 |
| Tsuyoshi Ozawa | 2002 | 1267 |
| Alptekin Ozkilic | 2010 | 2365 |
| Seiji Ozuka | 2001 | 996 |
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