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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 |
|---|---|---|---|---|---|---|---|---|---|
| Brian O'Brian | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Brien | 2015-2015 | .296 | 0 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Callahan | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 3 |
| Chris O'Colgley | 2015-2015 | .283 | 10 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Dell | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Donald O'Herlihy | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 2016-2016 | .323 | 0 | 2 | 4 | 4 | 0 | 4.50 | 46 |
| Ron O'Slattery | 2016-2016 | .219 | 0 | 3 | 9 | 5 | 0 | 3.34 | 89 |
| Jake O'Tomalty | 2017-2017 | .000 | 0 | 0 | 1 | 1 | 5 | 1.29 | 16 |
| Richard Ollivier | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ontiveros | 2015-2017 | .261 | 8 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Ormston | 2015-2017 | .211 | 0 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Orozco | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Lorenzo Ortega | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 21.60 | 1 |
| Norm Ortega | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Ortega | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Ortíz | 2016-2017 | .245 | 6 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Emílio Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Wesley Osborne | 2015-2016 | .265 | 8 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Owens | 2015-2015 | .257 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
