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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 | 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 | 2017-2017 | .000 | 0 | 0 | 17 | 10 | 0 | 3.93 | 259 |
| Paul O'Dell | 2017-2017 | .000 | 0 | 0 | 0 | 1 | 0 | 10.00 | 8 |
| Reese O'Donnell | 2016-2017 | .266 | 11 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Farrell | 2017-2017 | .000 | 0 | 0 | 7 | 8 | 15 | 3.95 | 47 |
| 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 |
| Tim O'Herlihy | 2016-2017 | .000 | 0 | 0 | 3 | 3 | 10 | 6.27 | 73 |
| Reese O'Higgins | 2014-2017 | .315 | 4 | 105 | 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 | 2016-2017 | .000 | 0 | 0 | 5 | 5 | 27 | 2.97 | 90 |
| Jim O'Neil | 2012-2014 | .000 | 0 | 0 | 5 | 3 | 6 | 4.22 | 83 |
| 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 | 2017-2017 | .305 | 28 | 90 | 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 |
| Dan O'Sullivan | 2014-2017 | .000 | 0 | 0 | 8 | 3 | 5 | 5.51 | 306 |
| John O'Sullivan | 2012-2012 | .333 | 3 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Emory O'Toole | 2013-2016 | .000 | 0 | 0 | 0 | 6 | 1 | 6.52 | 60 |
| Jesús Ochoa | 2012-2015 | .234 | 45 | 189 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Oglethorpe | 2015-2017 | .291 | 44 | 211 | 0 | 0 | 0 | 0.00 | 0 |
| Jun'ichi Ogura | 2017-2017 | .254 | 2 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Hideki Ohayashi | 2016-2017 | .000 | 0 | 0 | 2 | 2 | 0 | 5.66 | 34 |
| Kojuro Ohayashi | 2015-2017 | .217 | 7 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tatsukichi Ohayashi | 2015-2015 | .227 | 6 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Keitaro Ojima | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshino Okabe | 2016-2017 | .320 | 7 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Masayuki Okada | 2017-2017 | .000 | 0 | 0 | 5 | 2 | 3 | 4.73 | 85 |
| Tsumemasa Okada | 2014-2015 | .000 | 0 | 0 | 3 | 1 | 2 | 5.08 | 37 |
| Michihiro Okamoto | 2015-2017 | .286 | 13 | 99 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Olivares | 2014-2017 | .000 | 0 | 0 | 9 | 8 | 3 | 4.78 | 107 |
| Wesley Oliver | 2012-2016 | .000 | 0 | 0 | 18 | 16 | 14 | 3.33 | 267 |
| Jeff Olsen | 2012-2017 | .000 | 0 | 0 | 34 | 30 | 0 | 4.88 | 384 |
| Marshall Olsen | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 6.75 | 0 |
| Dave Olson | 2015-2016 | .343 | 12 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Denny Olson | 2014-2015 | .222 | 3 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Shimei Omori | 2013-2017 | .233 | 13 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Taro Omori | 2017-2017 | .273 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Katsumi Onishi | 2017-2017 | .000 | 0 | 0 | 3 | 4 | 17 | 4.11 | 63 |
| Takao Onishi | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Yasujiro Ono | 2017-2017 | .000 | 0 | 0 | 7 | 3 | 26 | 3.42 | 57 |
| Pedro Ornelas | 2014-2017 | .294 | 19 | 120 | 0 | 0 | 0 | 0.00 | 0 |
| Cristián Orozco | 2012-2014 | .210 | 44 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Andrés Ortega | 2016-2017 | .208 | 15 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Ramiro Ortega | 2012-2013 | .000 | 0 | 0 | 2 | 4 | 17 | 2.18 | 60 |
| Adrián Ortíz | 2017-2017 | .313 | 11 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Ortíz | 2016-2016 | .000 | 0 | 0 | 1 | 2 | 0 | 6.85 | 15 |
| Iván Ortíz | 2014-2015 | .235 | 6 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2017-2017 | .000 | 0 | 0 | 2 | 3 | 0 | 5.20 | 45 |
| 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 Carlos Ortíz | 2015-2016 | .308 | 7 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ortíz | 2012-2012 | .000 | 0 | 0 | 3 | 9 | 0 | 6.08 | 59 |
| Orlando Ortíz | 2016-2017 | .228 | 12 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Pablo Ortíz | 2012-2012 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortíz | 2014-2017 | .000 | 0 | 0 | 7 | 8 | 5 | 5.35 | 142 |
| Roberto Ortíz | 2012-2015 | .257 | 12 | 143 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Osborn | 2012-2017 | .290 | 17 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Osborn | 2016-2016 | .251 | 5 | 60 | 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 |
| Chris Oswald | 2013-2017 | .146 | 3 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Otero | 2015-2016 | .275 | 8 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Tsukasa Otsuka | 2016-2017 | .235 | 8 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Owen | 2016-2017 | .319 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Woody Owen | 2016-2017 | .000 | 0 | 0 | 13 | 5 | 0 | 3.28 | 134 |
| 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 | 2012-2017 | .000 | 0 | 0 | 52 | 35 | 0 | 4.41 | 511 |
| Tom Owens | 2013-2017 | .000 | 0 | 0 | 15 | 6 | 0 | 3.23 | 141 |
| Kata Oyama | 2014-2017 | .274 | 9 | 51 | 0 | 0 | 0 | 0.00 | 0 |
