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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 |
|---|---|---|---|---|---|---|---|---|---|
| Dylan O'Brien | 2018-2019 | .206 | 7 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Merrill O'Brien | 2012-2014 | .233 | 19 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Craig O'Day | 2017-2017 | .274 | 11 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Tom O'Day | 2017-2018 | .000 | 0 | 0 | 22 | 13 | 0 | 3.79 | 346 |
| Paul O'Dell | 2017-2017 | .000 | 0 | 0 | 0 | 1 | 0 | 10.00 | 8 |
| Reese O'Donnell | 2016-2019 | .254 | 13 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Farrell | 2017-2019 | .000 | 0 | 0 | 23 | 16 | 40 | 3.55 | 177 |
| Tom O'Halloran | 2012-2017 | .000 | 0 | 0 | 20 | 37 | 0 | 6.61 | 357 |
| Cary O'Herlihy | 2012-2012 | .286 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Reese O'Higgins | 2014-2018 | .312 | 4 | 107 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Keggan | 2015-2016 | .000 | 0 | 0 | 3 | 4 | 4 | 2.95 | 72 |
| Jeff O'Macken | 2012-2012 | .000 | 0 | 0 | 5 | 7 | 0 | 4.27 | 89 |
| Joe O'Neal | 2012-2013 | .267 | 18 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Clayton O'Neil | 2016-2018 | .000 | 0 | 0 | 5 | 6 | 39 | 2.52 | 113 |
| Jim O'Neil | 2012-2014 | .000 | 0 | 0 | 5 | 3 | 6 | 4.22 | 83 |
| Mark O'Neil | 2019-2019 | .243 | 6 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Robert O'Neil | 2012-2017 | .248 | 36 | 131 | 0 | 0 | 0 | 0.00 | 0 |
| Steve O'Neil | 2013-2013 | .179 | 0 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Jayson O'Neill | 2017-2019 | .290 | 40 | 150 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Quinn | 2016-2017 | .000 | 0 | 0 | 15 | 14 | 0 | 3.52 | 219 |
| Roy O'Quinn | 2013-2017 | .242 | 33 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Foster O'Reilly | 2012-2017 | .301 | 4 | 103 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Rorke | 2012-2012 | .000 | 0 | 0 | 5 | 1 | 0 | 2.91 | 38 |
| Everett O'Rorke | 2019-2019 | .238 | 6 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Sullivan | 2014-2018 | .000 | 0 | 0 | 8 | 5 | 5 | 5.34 | 381 |
| John O'Sullivan | 2012-2012 | .333 | 3 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Emory O'Toole | 2013-2018 | .000 | 0 | 0 | 1 | 6 | 1 | 6.50 | 83 |
| Jesús Ochoa | 2012-2015 | .234 | 45 | 189 | 0 | 0 | 0 | 0.00 | 0 |
| José Ochoa | 2018-2019 | .000 | 0 | 0 | 3 | 8 | 24 | 2.30 | 59 |
| Bryant Oglethorpe | 2018-2019 | .000 | 0 | 0 | 9 | 9 | 15 | 5.39 | 131 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tony Oglethorpe | 2015-2018 | .297 | 46 | 229 | 0 | 0 | 0 | 0.00 | 0 |
| Jun'ichi Ogura | 2017-2019 | .261 | 7 | 96 | 0 | 0 | 0 | 0.00 | 0 |
| Hideki Ohayashi | 2016-2019 | .000 | 0 | 0 | 8 | 16 | 20 | 6.04 | 193 |
| Kojuro Ohayashi | 2015-2019 | .231 | 8 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Tatsukichi Ohayashi | 2015-2015 | .227 | 6 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Keitaro Ojima | 2017-2019 | .287 | 89 | 279 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshino Okabe | 2016-2019 | .309 | 17 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Masayuki Okada | 2017-2019 | .000 | 0 | 0 | 13 | 5 | 8 | 4.39 | 207 |
| Tsumemasa Okada | 2014-2015 | .000 | 0 | 0 | 3 | 1 | 2 | 5.08 | 37 |
| Michihiro Okamoto | 2015-2019 | .312 | 37 | 278 | 0 | 0 | 0 | 0.00 | 0 |
| Izumo Okumura | 2019-2019 | .000 | 0 | 0 | 3 | 0 | 1 | 3.32 | 81 |
| Carlos Olivares | 2014-2018 | .000 | 0 | 0 | 9 | 9 | 3 | 4.76 | 148 |
| Wesley Oliver | 2012-2016 | .000 | 0 | 0 | 18 | 16 | 14 | 3.33 | 267 |
| Jeff Olsen | 2012-2019 | .000 | 0 | 0 | 43 | 56 | 0 | 5.39 | 601 |
| Marshall Olsen | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 6.75 | 0 |
| Dave Olson | 2015-2019 | .319 | 22 | 179 | 0 | 0 | 0 | 0.00 | 0 |
| Denny Olson | 2014-2015 | .222 | 3 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Guillermo Olvera | 2019-2019 | .245 | 3 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Shimei Omori | 2013-2017 | .233 | 13 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Taro Omori | 2017-2019 | .268 | 4 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Katsumi Onishi | 2017-2017 | .000 | 0 | 0 | 3 | 4 | 17 | 4.11 | 63 |
| Takao Onishi | 2018-2019 | .000 | 0 | 0 | 17 | 22 | 0 | 6.13 | 196 |
| Mitsuhide Ono | 2018-2019 | .000 | 0 | 0 | 4 | 5 | 0 | 7.59 | 36 |
| Yasujiro Ono | 2017-2019 | .000 | 0 | 0 | 8 | 7 | 32 | 2.83 | 126 |
| Rick Oram | 2018-2019 | .000 | 0 | 0 | 3 | 3 | 0 | 6.27 | 22 |
| Pedro Ornelas | 2014-2019 | .298 | 29 | 199 | 0 | 0 | 0 | 0.00 | 0 |
| Adrián Orozco | 2019-2019 | .000 | 0 | 0 | 3 | 3 | 0 | 13.81 | 28 |
| Cristián Orozco | 2012-2014 | .210 | 44 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Orozco | 2018-2019 | .262 | 4 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Andrés Ortega | 2016-2019 | .211 | 32 | 137 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Manuel Ortega | 2019-2019 | .271 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Ramiro Ortega | 2012-2013 | .000 | 0 | 0 | 2 | 4 | 17 | 2.18 | 60 |
| Adrián Ortíz | 2017-2019 | .322 | 21 | 156 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Ortíz | 2016-2016 | .000 | 0 | 0 | 1 | 2 | 0 | 6.85 | 15 |
| Félix Ortíz | 2018-2019 | .000 | 0 | 0 | 10 | 5 | 2 | 2.64 | 82 |
| Iván Ortíz | 2014-2015 | .235 | 6 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortíz | 2019-2019 | .000 | 0 | 0 | 0 | 1 | 1 | 3.52 | 9 |
| Jorge Ortíz | 2017-2019 | .000 | 0 | 0 | 21 | 14 | 0 | 3.99 | 318 |
| José Ortíz | 2014-2016 | .000 | 0 | 0 | 4 | 4 | 3 | 4.87 | 106 |
| José Ortíz | 2017-2017 | .245 | 14 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2018-2019 | .000 | 0 | 0 | 5 | 14 | 0 | 9.05 | 86 |
| Juan Carlos Ortíz | 2015-2019 | .307 | 7 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ortíz | 2012-2012 | .000 | 0 | 0 | 3 | 9 | 0 | 6.08 | 59 |
| Orlando Ortíz | 2016-2019 | .226 | 19 | 107 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Ortíz | 2012-2012 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortíz | 2014-2019 | .000 | 0 | 0 | 11 | 10 | 6 | 5.33 | 224 |
| Roberto Ortíz | 2012-2015 | .257 | 12 | 143 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Ortíz | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 1 | 0.00 | 3 |
| Conrad Orton | 2018-2019 | .000 | 0 | 0 | 5 | 10 | 19 | 5.47 | 100 |
| Don Orton | 2019-2019 | .250 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Osborn | 2012-2019 | .280 | 24 | 105 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Osborn | 2016-2018 | .260 | 14 | 105 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Osborne | 2012-2013 | .000 | 0 | 0 | 3 | 1 | 3 | 5.17 | 66 |
| Robert Osborne | 2015-2016 | .000 | 0 | 0 | 10 | 13 | 0 | 4.69 | 134 |
| Rafael Ospira | 2019-2019 | .266 | 2 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Oswald | 2013-2017 | .146 | 3 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Makoto Ota | 2018-2019 | .233 | 15 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Otero | 2015-2019 | .267 | 8 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Otero | 2018-2019 | .000 | 0 | 0 | 9 | 11 | 58 | 3.54 | 116 |
| Tsukasa Otsuka | 2016-2018 | .228 | 9 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Guonçalo Otto | 2019-2019 | .000 | 0 | 0 | 2 | 3 | 0 | 6.36 | 49 |
| Dan Owen | 2016-2019 | .267 | 3 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Woody Owen | 2016-2018 | .000 | 0 | 0 | 23 | 12 | 0 | 3.58 | 282 |
| Dominic Owens | 2018-2019 | .349 | 4 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Jacob Owens | 2012-2012 | .000 | 0 | 0 | 0 | 2 | 0 | 7.54 | 17 |
| Keith Owens | 2012-2014 | .000 | 0 | 0 | 3 | 11 | 26 | 3.82 | 92 |
| Mike Owens | 2013-2016 | .000 | 0 | 0 | 4 | 5 | 0 | 5.52 | 125 |
| Nathan Owens | 2017-2017 | .000 | 0 | 0 | 0 | 1 | 0 | 3.38 | 7 |
| Ryan Owens | 2012-2018 | .000 | 0 | 0 | 53 | 36 | 0 | 4.47 | 535 |
| Tom Owens | 2019-2019 | .000 | 0 | 0 | 0 | 1 | 0 | 9.00 | 5 |
| Tom Owens | 2013-2018 | .000 | 0 | 0 | 17 | 8 | 0 | 3.16 | 174 |
| Kata Oyama | 2014-2018 | .272 | 9 | 51 | 0 | 0 | 0 | 0.00 | 0 |
