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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ju-hyung O | 2016-2016 | .000 | 0 | 0 | 0 | 1 | 0 | 10.80 | 3 |
| Dave O'Day | 2015-2017 | .294 | 23 | 177 | 0 | 0 | 0 | 0.00 | 0 |
| P.J. O'Keefe | 2015-2017 | .302 | 4 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Mark O'Monaghan | 2017-2017 | .264 | 4 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Ron O'Slattery | 2015-2015 | .000 | 0 | 0 | 1 | 0 | 0 | 1.08 | 6 |
| Dale O'Sullivan | 2017-2017 | 1.000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Alin Oanta | 2017-2017 | .000 | 0 | 0 | 8 | 9 | 0 | 6.04 | 65 |
| Brian Olivares | 2015-2015 | .282 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Lawrence Olsen | 2016-2016 | .289 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Olvera | 2016-2017 | .250 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olvero | 2016-2017 | .000 | 0 | 0 | 3 | 2 | 1 | 3.88 | 73 |
| Dave Orchard | 2015-2016 | .273 | 7 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2016-2017 | .261 | 1 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2017-2017 | .204 | 5 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2016-2017 | .000 | 0 | 0 | 3 | 7 | 5 | 7.84 | 33 |
| Luis Ortíz | 2016-2017 | .000 | 0 | 0 | 1 | 0 | 0 | 4.73 | 39 |
| Roger Osborne | 2015-2017 | .282 | 16 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Otero | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
