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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 |
|---|---|---|---|---|---|---|---|---|---|
| Merrill O'Brien | 2013-2013 | .252 | 5 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Callaghan | 2017-2017 | .223 | 6 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard O'Connor | 2012-2013 | .197 | 3 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Craig O'Day | 2017-2017 | .245 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Dell | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 9.90 | 8 |
| Reese O'Donnell | 2013-2016 | .269 | 12 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Farrell | 2016-2016 | .000 | 0 | 0 | 9 | 3 | 5 | 2.65 | 74 |
| Tom O'Halloran | 2012-2016 | .000 | 0 | 0 | 33 | 28 | 0 | 4.08 | 448 |
| Cary O'Herlihy | 2012-2013 | .229 | 17 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| Tim O'Herlihy | 2016-2017 | .000 | 0 | 0 | 10 | 6 | 16 | 2.69 | 156 |
| Reese O'Higgins | 2013-2014 | .278 | 3 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Neal | 2013-2013 | .600 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Clayton O'Neil | 2016-2016 | .000 | 0 | 0 | 0 | 4 | 15 | 3.33 | 44 |
| Jerry O'Neil | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jim O'Neil | 2012-2014 | .000 | 0 | 0 | 6 | 7 | 8 | 2.44 | 89 |
| Robert O'Neil | 2014-2015 | .267 | 23 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Quinn | 2014-2015 | .000 | 0 | 0 | 14 | 12 | 0 | 3.55 | 225 |
| Roy O'Quinn | 2012-2013 | .261 | 15 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Sullivan | 2012-2014 | .000 | 0 | 0 | 13 | 7 | 28 | 4.46 | 153 |
| John O'Sullivan | 2012-2012 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Emory O'Toole | 2012-2017 | .000 | 0 | 0 | 15 | 11 | 12 | 3.66 | 310 |
| Francisco Ochoa | 2013-2014 | .000 | 0 | 0 | 8 | 4 | 2 | 3.74 | 107 |
| Jesús Ochoa | 2012-2017 | .240 | 33 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| José Ochoa | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pancho Ochoa | 2014-2017 | .000 | 0 | 0 | 10 | 3 | 0 | 4.58 | 123 |
| Troy Odom | 2012-2012 | .000 | 0 | 0 | 4 | 2 | 0 | 3.51 | 40 |
| Hiroji Ogawa | 2015-2017 | .185 | 1 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Tomohiko Ogawa | 2016-2016 | .214 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Bryant Oglethorpe | 2016-2017 | .000 | 0 | 0 | 8 | 12 | 44 | 4.58 | 84 |
| Tony Oglethorpe | 2015-2015 | .417 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jun'ichi Ogura | 2013-2014 | .269 | 11 | 110 | 0 | 0 | 0 | 0.00 | 0 |
| Hideki Ohayashi | 2016-2016 | .000 | 0 | 0 | 1 | 2 | 0 | 5.74 | 13 |
| Kojuro Ohayashi | 2014-2016 | .275 | 11 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Takahashi Ohayashi | 2014-2017 | .213 | 39 | 158 | 0 | 0 | 0 | 0.00 | 0 |
| Tatsukichi Ohayashi | 2014-2017 | .202 | 4 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ojeda | 2013-2017 | .000 | 0 | 0 | 4 | 3 | 0 | 4.95 | 52 |
| Yoshino Okabe | 2015-2017 | .260 | 47 | 211 | 0 | 0 | 0 | 0.00 | 0 |
| Masayuki Okada | 2016-2016 | .000 | 0 | 0 | 4 | 5 | 19 | 2.51 | 70 |
| Tsumemasa Okada | 2014-2014 | .000 | 0 | 0 | 0 | 0 | 0 | 2.45 | 2 |
| Michihiro Okamoto | 2015-2017 | .313 | 4 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Olivares | 2013-2013 | .000 | 0 | 0 | 3 | 0 | 4 | 2.48 | 29 |
| Harumi Oliver | 2016-2016 | .294 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Wesley Oliver | 2015-2015 | .000 | 0 | 0 | 1 | 1 | 3 | 5.49 | 25 |
| Dave Olson | 2017-2017 | .308 | 16 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Denny Olson | 2012-2015 | .250 | 46 | 176 | 0 | 0 | 0 | 0.00 | 0 |
| Wayne Olson | 2012-2012 | .193 | 2 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Shimei Omori | 2013-2016 | .268 | 37 | 130 | 0 | 0 | 0 | 0.00 | 0 |
| Taro Omori | 2017-2017 | .219 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Hirohisa Onishi | 2017-2017 | .000 | 0 | 0 | 3 | 3 | 0 | 7.98 | 71 |
| Katsumi Onishi | 2016-2016 | .000 | 0 | 0 | 6 | 5 | 32 | 3.32 | 75 |
| Takao Onishi | 2016-2017 | .000 | 0 | 0 | 23 | 25 | 0 | 5.76 | 303 |
| Yasukazu Onishi | 2017-2017 | .318 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Tsurayuki Ono | 2017-2017 | .000 | 0 | 0 | 1 | 2 | 0 | 7.80 | 18 |
| Yasujiro Ono | 2016-2016 | .000 | 0 | 0 | 1 | 0 | 20 | 1.95 | 36 |
| Rick Oram | 2014-2017 | .000 | 0 | 0 | 1 | 2 | 5 | 3.97 | 24 |
| Sergio Orozco | 2017-2017 | .237 | 5 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Andrés Ortega | 2015-2015 | .252 | 14 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Adrián Ortíz | 2016-2017 | .283 | 3 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Ortíz | 2014-2017 | .000 | 0 | 0 | 7 | 7 | 5 | 4.33 | 117 |
| Félix Ortíz | 2016-2017 | .000 | 0 | 0 | 6 | 7 | 20 | 4.92 | 76 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Iván Ortíz | 2014-2014 | .286 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2017-2017 | .000 | 0 | 0 | 3 | 0 | 1 | 1.42 | 16 |
| José Ortíz | 2012-2015 | .000 | 0 | 0 | 4 | 5 | 0 | 5.53 | 30 |
| José Ortíz | 2012-2017 | .000 | 0 | 0 | 12 | 12 | 2 | 4.33 | 203 |
| Juan Carlos Ortíz | 2015-2015 | .417 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Orlando Ortíz | 2016-2016 | .250 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Ortíz | 2012-2012 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortíz | 2012-2017 | .000 | 0 | 0 | 14 | 11 | 65 | 3.71 | 219 |
| Sergio Ortíz | 2014-2017 | .000 | 0 | 0 | 33 | 31 | 0 | 4.72 | 508 |
| Conrad Orton | 2016-2017 | .000 | 0 | 0 | 7 | 10 | 36 | 4.00 | 116 |
| Don Orton | 2014-2017 | .273 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Osborn | 2012-2012 | .231 | 5 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Osborn | 2017-2017 | .244 | 14 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| George Osborne | 2013-2013 | .260 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Osborne | 2012-2012 | .000 | 0 | 0 | 2 | 0 | 4 | 1.47 | 72 |
| Paul Osborne | 2014-2014 | .232 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Osborne | 2014-2014 | .000 | 0 | 0 | 11 | 11 | 0 | 3.49 | 173 |
| Harold Osburn | 2013-2015 | .000 | 0 | 0 | 8 | 6 | 3 | 4.42 | 168 |
| Chris Oswald | 2012-2016 | .232 | 16 | 106 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Otero | 2015-2015 | .303 | 8 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Otero | 2017-2017 | .000 | 0 | 0 | 2 | 1 | 3 | 3.52 | 6 |
| Tsukasa Otsuka | 2015-2017 | .250 | 17 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Quentin Ottaway | 2013-2014 | .210 | 2 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Guonçalo Otto | 2016-2017 | .000 | 0 | 0 | 8 | 22 | 0 | 6.46 | 148 |
| Dan Owen | 2016-2017 | .264 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Woody Owen | 2014-2016 | .000 | 0 | 0 | 7 | 22 | 0 | 5.39 | 265 |
| Jacob Owens | 2013-2017 | .000 | 0 | 0 | 13 | 9 | 7 | 5.49 | 259 |
| Keith Owens | 2013-2015 | .000 | 0 | 0 | 4 | 0 | 0 | 5.15 | 72 |
| Mike Owens | 2012-2016 | .000 | 0 | 0 | 4 | 1 | 2 | 2.03 | 44 |
| Nathan Owens | 2017-2017 | .000 | 0 | 0 | 1 | 0 | 1 | 2.91 | 21 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tom Owens | 2012-2013 | .000 | 0 | 0 | 4 | 2 | 0 | 3.20 | 33 |
| Kata Oyama | 2013-2017 | .270 | 14 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Shunso Oyama | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 3.86 | 1 |
