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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ed O'Bryan | 2015-2016 | .333 | 0 | 0 | 1 | 1 | 0 | 4.97 | 14 |
| Ramiro Ocampo | 2021-2039 | .252 | 110 | 371 | 0 | 0 | 0 | 0.00 | 0 |
| Orinosuke Ohara | 2011-2011 | .300 | 1 | 6 | 3 | 3 | 0 | 4.97 | 27 |
| Kuniaki Ohayashi | 2007-2010 | .336 | 7 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Tetsuo Okazaki | 2018-2019 | .000 | 0 | 0 | 1 | 5 | 13 | 5.26 | 55 |
| Juan Olivares | 2007-2010 | .225 | 0 | 4 | 18 | 22 | 0 | 5.10 | 157 |
| Kevin Orozco | 2028-2039 | .074 | 1 | 2 | 8 | 13 | 4 | 3.60 | 242 |
| César Ortega | 2012-2016 | .133 | 0 | 2 | 8 | 2 | 1 | 2.03 | 125 |
| Bill Ortíz | 2033-2039 | .300 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ortíz | 2034-2037 | .151 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2018-2018 | .000 | 0 | 0 | 2 | 0 | 1 | 4.30 | 31 |
| Júlio Ortíz | 2026-2035 | .167 | 1 | 2 | 7 | 9 | 1 | 3.96 | 157 |
| Nelson Ortíz | 2018-2020 | .000 | 0 | 0 | 8 | 0 | 1 | 2.24 | 65 |
| Tomás Ortíz | 2035-2037 | .239 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Otero | 2016-2018 | .000 | 0 | 0 | 2 | 9 | 20 | 3.39 | 77 |
