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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 |
|---|---|---|---|---|---|---|---|---|---|
| Charles O'Brian | 2011-2012 | .111 | 1 | 5 | 10 | 9 | 0 | 4.70 | 141 |
| Dawson O'Day | 2011-2012 | .339 | 21 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Terry O'Dell | 2011-2011 | .333 | 4 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Dennis O'Farrell | 2014-2014 | .250 | 0 | 0 | 0 | 0 | 0 | 2.00 | 10 |
| Bradley O'Harly | 2010-2010 | .400 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Vaughn O'Hawley | 2010-2010 | .412 | 4 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| George O'Higgins | 2015-2015 | .348 | 1 | 3 | 2 | 7 | 0 | 4.26 | 65 |
| Herb O'Keerwin | 2015-2015 | .200 | 1 | 5 | 6 | 6 | 0 | 4.07 | 60 |
| Joe O'Neil | 2013-2013 | .320 | 12 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Walton O'Rorke | 2013-2015 | .155 | 1 | 10 | 8 | 29 | 0 | 4.39 | 284 |
| Marvin O'Rourke | 2014-2015 | .294 | 17 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Jimmy O'Toole | 2013-2013 | .250 | 5 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Tomás Ochoa | 2013-2015 | .188 | 0 | 1 | 10 | 6 | 8 | 5.03 | 120 |
| Orinosuke Okumura | 2014-2015 | .244 | 28 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Olivas | 2015-2015 | .167 | 0 | 0 | 2 | 1 | 1 | 7.31 | 29 |
| Ernesto Oliveira | 2012-2014 | .250 | 0 | 6 | 25 | 13 | 21 | 2.67 | 242 |
| Juan Oliveira | 2014-2014 | .305 | 10 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Kyle Olson | 2012-2014 | .202 | 2 | 21 | 52 | 7 | 0 | 2.50 | 425 |
| Mason Olson | 2011-2013 | .095 | 1 | 2 | 17 | 15 | 0 | 3.10 | 286 |
| Ryan Olson | 2014-2014 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| José Ordóñez | 2014-2015 | .429 | 0 | 2 | 5 | 1 | 14 | 1.55 | 117 |
| Oliver Ordóñez | 2015-2015 | .297 | 11 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Ángel Orosco | 2011-2013 | .033 | 0 | 0 | 10 | 15 | 24 | 3.50 | 202 |
| Richard Orr | 2011-2012 | .322 | 8 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Ortega | 2015-2015 | .293 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Guillermo Ortega | 2012-2014 | .303 | 16 | 132 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2015-2015 | .179 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Ortíz | 2012-2012 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2014-2014 | .335 | 12 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortíz | 2012-2014 | .230 | 25 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Daniel Osborne | 2012-2012 | .286 | 10 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Jimmy Osborne | 2010-2011 | .337 | 23 | 108 | 14 | 13 | 0 | 5.21 | 174 |
| Matt Owen | 2011-2013 | .280 | 24 | 142 | 0 | 0 | 0 | 0.00 | 0 |
