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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 | 2017-2017 | .254 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Roark O'Brien | 2015-2015 | .000 | 0 | 0 | 3 | 4 | 16 | 5.93 | 44 |
| Leonard O'Connor | 2012-2014 | .172 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Scott O'Connor | 2017-2017 | .220 | 2 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Jaime O'Day | 2015-2015 | .268 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Dell | 2017-2017 | .000 | 0 | 0 | 0 | 2 | 1 | 6.88 | 12 |
| Danny O'Doherty | 2017-2017 | .249 | 0 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Donnell | 2012-2012 | .000 | 0 | 0 | 0 | 2 | 0 | 4.64 | 23 |
| Reese O'Donnell | 2013-2014 | .211 | 6 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Ed O'Dwyer | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Farrell | 2015-2016 | .000 | 0 | 0 | 4 | 1 | 4 | 2.79 | 84 |
| Tom O'Halloran | 2012-2012 | .000 | 0 | 0 | 1 | 2 | 0 | 3.08 | 26 |
| Reese O'Higgins | 2013-2013 | .252 | 7 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry O'Neil | 2016-2017 | .081 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Myles O'Neill | 2016-2017 | .183 | 1 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Quinn | 2014-2014 | .000 | 0 | 0 | 8 | 3 | 0 | 2.89 | 88 |
| Roy O'Quinn | 2012-2012 | .292 | 9 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Rorke | 2013-2013 | .000 | 0 | 0 | 1 | 1 | 0 | 3.27 | 17 |
| Everett O'Rorke | 2017-2017 | .400 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Sullivan | 2012-2012 | .000 | 0 | 0 | 0 | 0 | 3 | 4.77 | 5 |
| Emory O'Toole | 2012-2013 | .000 | 0 | 0 | 2 | 2 | 14 | 1.73 | 64 |
| Francisco Ochoa | 2012-2012 | .000 | 0 | 0 | 4 | 0 | 2 | 1.37 | 115 |
| José Ochoa | 2016-2017 | .000 | 0 | 0 | 5 | 5 | 5 | 2.87 | 171 |
| Pancho Ochoa | 2014-2015 | .000 | 0 | 0 | 4 | 2 | 9 | 1.76 | 76 |
| Pedro Ochoa | 2012-2012 | .193 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Troy Odom | 2012-2012 | .000 | 0 | 0 | 0 | 3 | 1 | 3.19 | 32 |
| Hidehira Ogawa | 2017-2017 | .287 | 2 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Hiroji Ogawa | 2014-2017 | .238 | 10 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Naizen Ogawa | 2013-2014 | .000 | 0 | 0 | 6 | 6 | 0 | 3.48 | 84 |
| Ryoma Ogawa | 2015-2015 | .152 | 7 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tomohiko Ogawa | 2016-2017 | .173 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Joël Oger | 2015-2017 | .231 | 29 | 172 | 0 | 0 | 0 | 0.00 | 0 |
| Bryant Oglethorpe | 2014-2016 | .000 | 0 | 0 | 5 | 22 | 50 | 3.66 | 152 |
| Tony Oglethorpe | 2015-2015 | .327 | 4 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Nobukazu Ogura | 2017-2017 | .235 | 9 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Tsurayuki Ohara | 2017-2017 | .000 | 0 | 0 | 1 | 0 | 0 | 7.45 | 27 |
| Sekien Ohashi | 2015-2016 | .192 | 3 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Hideki Ohayashi | 2016-2016 | .000 | 0 | 0 | 18 | 5 | 0 | 2.16 | 123 |
| Kojuro Ohayashi | 2014-2017 | .317 | 3 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Kyoji Ohayashi | 2017-2017 | .000 | 0 | 0 | 1 | 6 | 0 | 7.78 | 42 |
| Masu Ohayashi | 2015-2016 | .199 | 8 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Matsu Ohayashi | 2015-2016 | .191 | 11 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Mito Ohayashi | 2017-2017 | .000 | 0 | 0 | 3 | 6 | 0 | 6.40 | 64 |
| Shirai Ohayashi | 2015-2017 | .000 | 0 | 0 | 5 | 9 | 1 | 7.47 | 118 |
| Takahashi Ohayashi | 2013-2017 | .235 | 9 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Tatsukichi Ohayashi | 2013-2017 | .252 | 22 | 141 | 0 | 0 | 0 | 0.00 | 0 |
| Shuncho Oike | 2014-2016 | .173 | 4 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ojeda | 2012-2017 | .000 | 0 | 0 | 8 | 11 | 39 | 3.61 | 230 |
| Kanzaburo Ojima | 2017-2017 | .209 | 4 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Keitaro Ojima | 2017-2017 | .289 | 22 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Noritada Ojima | 2014-2014 | .134 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Takiji Ojima | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Isei Okada | 2015-2015 | .000 | 0 | 0 | 2 | 2 | 0 | 6.23 | 12 |
| Masayuki Okada | 2015-2015 | .000 | 0 | 0 | 1 | 4 | 1 | 3.30 | 99 |
| Nobuyoshi Okada | 2016-2016 | .000 | 0 | 0 | 0 | 2 | 0 | 9.31 | 9 |
| Masamichi Okamoto | 2017-2017 | .217 | 2 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Michihiro Okamoto | 2013-2015 | .232 | 10 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Tetsui Okamoto | 2013-2013 | .168 | 15 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Yachi Okamoto | 2017-2017 | .229 | 4 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Kenji Okazaki | 2013-2013 | .222 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Izumo Okumura | 2013-2017 | .000 | 0 | 0 | 10 | 17 | 4 | 4.04 | 259 |
| Carlos Olivares | 2012-2013 | .000 | 0 | 0 | 9 | 25 | 0 | 4.08 | 191 |
| Harumi Oliver | 2012-2015 | .238 | 13 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Olsen | 2017-2017 | .232 | 5 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron Olson | 2012-2016 | .177 | 2 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Wayne Olson | 2013-2016 | .303 | 0 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Will Olson | 2012-2012 | .000 | 0 | 0 | 2 | 1 | 0 | 2.53 | 28 |
| Guillermo Olvera | 2016-2017 | .225 | 18 | 105 | 0 | 0 | 0 | 0.00 | 0 |
| Shimei Omori | 2013-2013 | .356 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Taro Omori | 2017-2017 | .265 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Hirohisa Onishi | 2014-2015 | .000 | 0 | 0 | 10 | 9 | 0 | 3.76 | 143 |
| Katsumi Onishi | 2015-2015 | .000 | 0 | 0 | 4 | 2 | 43 | 2.90 | 72 |
| Takao Onishi | 2015-2015 | .000 | 0 | 0 | 10 | 14 | 0 | 3.49 | 171 |
| Yasukazu Onishi | 2016-2016 | .500 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mitsuhide Ono | 2017-2017 | .000 | 0 | 0 | 3 | 4 | 0 | 4.36 | 58 |
| Tsurayuki Ono | 2015-2017 | .000 | 0 | 0 | 14 | 13 | 0 | 4.06 | 265 |
| Yasujiro Ono | 2016-2016 | .000 | 0 | 0 | 3 | 5 | 13 | 2.77 | 55 |
| Ichizo Onodera | 2016-2017 | .310 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Oram | 2013-2017 | .139 | 4 | 11 | 17 | 13 | 19 | 3.24 | 233 |
| Pedro Ornelas | 2013-2014 | .218 | 18 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Adrián Orozco | 2015-2017 | .000 | 0 | 0 | 12 | 15 | 4 | 3.72 | 250 |
| Sergio Orozco | 2017-2017 | .265 | 10 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Ortega | 2015-2017 | .000 | 0 | 0 | 6 | 10 | 20 | 5.90 | 69 |
| Adrián Ortíz | 2016-2016 | .256 | 8 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Ortíz | 2012-2015 | .000 | 0 | 0 | 19 | 11 | 5 | 2.32 | 287 |
| Félix Ortíz | 2016-2016 | .000 | 0 | 0 | 4 | 2 | 1 | 2.60 | 36 |
| Jesús Ortíz | 2017-2017 | .000 | 0 | 0 | 5 | 4 | 2 | 4.16 | 72 |
| Jorge Ortíz | 2013-2016 | .000 | 0 | 0 | 13 | 32 | 13 | 4.26 | 359 |
| José Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2012-2016 | .000 | 0 | 0 | 17 | 32 | 2 | 4.15 | 276 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| José Ortíz | 2017-2017 | .000 | 0 | 0 | 1 | 0 | 0 | 1.50 | 7 |
| Juan Ortíz | 2016-2017 | .000 | 0 | 0 | 9 | 28 | 0 | 4.68 | 286 |
| Juan Carlos Ortíz | 2013-2014 | .233 | 11 | 91 | 0 | 0 | 0 | 0.00 | 0 |
| Manolo Ortíz | 2012-2012 | .214 | 3 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Orlando Ortíz | 2013-2016 | .213 | 20 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortíz | 2012-2012 | .000 | 0 | 0 | 3 | 1 | 1 | 0.89 | 32 |
| Sergio Ortíz | 2012-2013 | .000 | 0 | 0 | 8 | 10 | 1 | 2.99 | 183 |
| Conrad Orton | 2014-2016 | .000 | 0 | 0 | 7 | 12 | 45 | 4.41 | 108 |
| Don Orton | 2014-2017 | .225 | 6 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Pete Osborn | 2017-2017 | .200 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| George Osborne | 2012-2013 | .217 | 4 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Osborne | 2012-2012 | .000 | 0 | 0 | 0 | 1 | 0 | 0.00 | 0 |
| Paul Osborne | 2012-2013 | .212 | 16 | 107 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Osborne | 2014-2014 | .000 | 0 | 0 | 1 | 0 | 0 | 2.03 | 14 |
| Harold Osburn | 2012-2016 | .000 | 0 | 0 | 1 | 1 | 1 | 6.17 | 8 |
| Junji Oshima | 2013-2015 | .121 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Oswald | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Makoto Ota | 2017-2017 | .264 | 3 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Otero | 2014-2014 | .210 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Otero | 2015-2017 | .000 | 0 | 0 | 7 | 15 | 39 | 4.82 | 131 |
| Tsukasa Otsuka | 2014-2015 | .245 | 23 | 138 | 0 | 0 | 0 | 0.00 | 0 |
| Quentin Ottaway | 2012-2016 | .246 | 7 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Guonçalo Otto | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 5.40 | 2 |
| Dan Owen | 2015-2017 | .299 | 20 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Woody Owen | 2014-2014 | .000 | 0 | 0 | 6 | 2 | 0 | 2.85 | 89 |
| Dominic Owens | 2017-2017 | .342 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Jacob Owens | 2014-2015 | .000 | 0 | 0 | 2 | 1 | 0 | 4.01 | 126 |
| Mike Owens | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 1.54 | 16 |
| Nathan Owens | 2014-2017 | .000 | 0 | 0 | 5 | 3 | 16 | 3.24 | 107 |
| Tom Owens | 2012-2012 | .000 | 0 | 0 | 7 | 11 | 0 | 2.80 | 131 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Kata Oyama | 2013-2013 | .100 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Shunso Oyama | 2013-2016 | .000 | 0 | 0 | 13 | 9 | 3 | 2.31 | 175 |
| Takanori Ozaki | 2017-2017 | .000 | 0 | 0 | 0 | 1 | 0 | 3.80 | 26 |
