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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Scott O'Callahan | 2010-2010 | .315 | 8 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Leroy O'Connor | 2037-2038 | .259 | 8 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Pete O'Connor | 2026-2033 | .000 | 0 | 0 | 20 | 38 | 3 | 6.07 | 518 |
| Peter O'Connor | 2009-2015 | .253 | 7 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Willie O'Cronin | 2037-2037 | .204 | 3 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Donald O'Day | 2008-2008 | .165 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Greg O'Day | 2009-2009 | .244 | 11 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Dell | 2025-2028 | .196 | 10 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin O'Dell | 2037-2038 | .267 | 15 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Marc O'Dwyer | 2031-2032 | .000 | 0 | 0 | 7 | 8 | 0 | 3.50 | 163 |
| Jeff O'Fennaghty | 2007-2007 | .286 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Ed O'Hagan | 2037-2038 | .000 | 0 | 0 | 10 | 15 | 3 | 4.41 | 175 |
| Micheal O'Halloran | 2008-2008 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bill O'Higgins | 2032-2032 | .231 | 3 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Ben O'Keefe | 2007-2007 | .000 | 0 | 0 | 2 | 0 | 1 | 0.00 | 10 |
| Craig O'Learie | 2011-2013 | .217 | 7 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Robbie O'Neil | 2020-2021 | .000 | 0 | 0 | 11 | 6 | 0 | 3.01 | 228 |
| Jeff O'Quinslean | 2014-2018 | .252 | 8 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Cody O'Reilly | 2016-2016 | .000 | 0 | 0 | 2 | 3 | 0 | 5.13 | 49 |
| Matt O'Rourke | 2025-2028 | .246 | 10 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Bill O'Sexton | 2038-2038 | .000 | 0 | 0 | 1 | 2 | 0 | 5.90 | 21 |
| Joe O'Sullivan | 2017-2017 | .000 | 0 | 0 | 4 | 0 | 0 | 2.24 | 67 |
| Juan Ochoa | 2029-2031 | .000 | 0 | 0 | 22 | 18 | 0 | 4.07 | 338 |
| Joe Odom | 2034-2036 | .205 | 3 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Akihiro Ogasahara | 2007-2009 | .000 | 0 | 0 | 1 | 0 | 1 | 1.46 | 22 |
| Tadamichi Ogawa | 2009-2009 | .216 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Oglethorpe | 2009-2009 | .222 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| César Ohayashi | 2034-2034 | .000 | 0 | 0 | 3 | 3 | 3 | 2.67 | 93 |
| Tadamasa Oike | 2009-2009 | .000 | 0 | 0 | 1 | 0 | 2 | 2.00 | 4 |
| António Ojeda | 2013-2015 | .000 | 0 | 0 | 9 | 7 | 17 | 1.61 | 227 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Kuniyoshi Okamoto | 2010-2010 | .000 | 0 | 0 | 4 | 2 | 17 | 3.44 | 55 |
| Takehide Okamoto | 2009-2009 | .000 | 0 | 0 | 6 | 8 | 4 | 3.35 | 102 |
| Shuichi Okumura | 2014-2015 | .227 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Olivares | 2038-2038 | .285 | 8 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Olivares | 2020-2023 | .276 | 21 | 152 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Oliveira | 2010-2011 | .000 | 0 | 0 | 12 | 20 | 1 | 3.68 | 282 |
| Wolde-Selassie Omaswa | 2035-2036 | .000 | 0 | 0 | 2 | 1 | 0 | 2.39 | 49 |
| Wakie Omolara | 2038-2038 | .000 | 0 | 0 | 2 | 2 | 29 | 2.75 | 100 |
| Sosuke Omori | 2007-2008 | .000 | 0 | 0 | 6 | 9 | 10 | 2.79 | 122 |
| Kozue Ono | 2015-2017 | .210 | 7 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Yoriie Ono | 2007-2008 | .206 | 7 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Cristo Ontiveros | 2017-2018 | .425 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| José Ordóńez | 2038-2038 | .303 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ordóńez | 2016-2017 | .267 | 6 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Héctor Orellano | 2038-2038 | .250 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Javier Orozco | 2020-2022 | .235 | 6 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| José Orozco | 2020-2020 | .000 | 0 | 0 | 0 | 1 | 0 | 2.20 | 19 |
| Luis Orozco | 2038-2038 | .000 | 0 | 0 | 7 | 4 | 0 | 4.03 | 94 |
| Carl Orr | 2032-2034 | .000 | 0 | 0 | 12 | 15 | 1 | 5.51 | 269 |
| Chris Orr | 2009-2009 | .059 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| António Ortega | 2036-2037 | .000 | 0 | 0 | 0 | 0 | 0 | 6.75 | 5 |
| António Ortega | 2007-2007 | .000 | 0 | 0 | 8 | 12 | 0 | 2.95 | 173 |
| Jorge Ortega | 2030-2031 | .000 | 0 | 0 | 8 | 4 | 3 | 4.99 | 192 |
| Augusto Ortíz | 2035-2038 | .000 | 0 | 0 | 17 | 27 | 6 | 4.51 | 241 |
| Carlos Ortíz | 2025-2030 | .000 | 0 | 0 | 21 | 26 | 3 | 4.05 | 421 |
| Felipe Ortíz | 2033-2034 | .000 | 0 | 0 | 13 | 7 | 0 | 3.52 | 167 |
| Gerardo Ortíz | 2008-2008 | .071 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ismael Ortíz | 2027-2028 | .207 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Javier Ortíz | 2007-2008 | .259 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2030-2031 | .000 | 0 | 0 | 9 | 7 | 1 | 4.03 | 118 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Júlio Ortíz | 2038-2038 | .341 | 9 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Orsino Ortíz | 2026-2027 | .000 | 0 | 0 | 10 | 6 | 4 | 4.84 | 153 |
| Rafael Ortíz | 2007-2007 | .333 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Wilson Ortíz | 2009-2009 | .267 | 6 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Osborne | 2012-2014 | .000 | 0 | 0 | 6 | 12 | 0 | 3.46 | 183 |
| Patrick Osborne | 2020-2021 | .288 | 16 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Tokuma Oshima | 2007-2007 | .000 | 0 | 0 | 4 | 6 | 0 | 2.85 | 89 |
| Jaap Oskam | 2032-2035 | .000 | 0 | 0 | 21 | 24 | 5 | 3.85 | 404 |
| Anastasio Otero | 2011-2012 | .000 | 0 | 0 | 4 | 8 | 0 | 3.26 | 77 |
| Augusto Otero | 2037-2038 | .000 | 0 | 0 | 12 | 4 | 2 | 5.70 | 124 |
| Sloan Otto | 2013-2016 | .000 | 0 | 0 | 25 | 20 | 9 | 2.79 | 296 |
| Luo-shan Ou | 2012-2013 | .220 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Owen | 2030-2034 | .000 | 0 | 0 | 39 | 11 | 19 | 3.64 | 613 |
| Ed Owens | 2009-2009 | .154 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Trevor Owens | 2007-2007 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Takuya Oyama | 2020-2020 | .167 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
