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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 |
| Eddie O'Bryan | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Callahan | 2015-2019 | .000 | 0 | 0 | 0 | 2 | 0 | 7.88 | 19 |
| Chris O'Colgley | 2015-2015 | .283 | 10 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard O'Connor | 2019-2019 | .296 | 15 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Robert O'Connor | 2018-2019 | .274 | 16 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Day | 2019-2019 | .175 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Dell | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Nathaniel O'Heyne | 2019-2019 | .029 | 0 | 5 | 5 | 9 | 0 | 4.87 | 69 |
| Christian O'Neal | 2018-2019 | .294 | 6 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 2016-2019 | .333 | 0 | 2 | 7 | 7 | 1 | 5.70 | 91 |
| Ron O'Slattery | 2016-2016 | .219 | 0 | 3 | 9 | 5 | 0 | 3.34 | 89 |
| Jake O'Tomalty | 2017-2019 | .667 | 0 | 1 | 7 | 7 | 36 | 3.42 | 122 |
| Taro Ohayashi | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Akihiko Oike | 2018-2019 | .285 | 39 | 136 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Ollivier | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ontiveros | 2015-2018 | .245 | 9 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Ormston | 2015-2019 | .225 | 2 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Orozco | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 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 | 2019-2019 | .305 | 9 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Ortega | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ortega | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Ortíz | 2016-2018 | .245 | 6 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Cisco Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tony Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Osborne | 2019-2019 | .333 | 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 |
