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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Osano Obayana | 1988-1988 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 2 | 3.0 | 4 | 0 | 0 | 0 | 2 |
| Noriyuki Ochiai | 1988-1988 | 0 | 0 | .000 | 1.23 | 5 | 0 | 0 | 0 | 2 | 7.1 | 4 | 1 | 0 | 3 | 5 |
| Charlie Ogden | 1964-1964 | 0 | 1 | .000 | 13.50 | 1 | 1 | 0 | 0 | 0 | 4.0 | 10 | 6 | 0 | 3 | 1 |
| Cisco Ogegeda | 1972-1972 | 0 | 0 | .000 | 4.50 | 1 | 1 | 0 | 0 | 0 | 2.0 | 2 | 1 | 0 | 3 | 1 |
| Robbie Ohon | 1984-1988 | 1 | 1 | .500 | 4.91 | 5 | 2 | 1 | 0 | 0 | 14.2 | 12 | 8 | 1 | 8 | 10 |
| Degife Ola | 1968-1968 | 0 | 1 | .000 | 16.78 | 5 | 5 | 0 | 0 | 0 | 12.1 | 30 | 23 | 3 | 16 | 3 |
| Luis Olvera | 1980-1980 | 0 | 2 | .000 | 4.66 | 2 | 2 | 0 | 0 | 0 | 9.2 | 11 | 5 | 0 | 5 | 6 |
| Eskinder Omondi | 1964-1968 | 1 | 1 | .500 | 7.59 | 9 | 1 | 0 | 0 | 3 | 10.2 | 10 | 9 | 0 | 12 | 9 |
| Cesar Ooyendijk | 1968-1968 | 0 | 0 | .000 | 2.25 | 1 | 1 | 0 | 0 | 0 | 4.0 | 6 | 1 | 0 | 4 | 0 |
| António Ortega | 1972-1972 | 0 | 0 | .000 | 17.18 | 2 | 0 | 0 | 0 | 1 | 3.2 | 7 | 7 | 0 | 1 | 1 |
| Juan Ortega | 1960-1960 | 0 | 0 | .000 | 8.44 | 3 | 0 | 0 | 0 | 0 | 5.1 | 8 | 5 | 0 | 5 | 1 |
| Ángel Ortíz | 1968-1968 | 0 | 0 | .000 | 3.38 | 4 | 0 | 0 | 0 | 1 | 8.0 | 4 | 3 | 0 | 4 | 8 |
| Dani Ortíz | 1984-1984 | 0 | 0 | .000 | 2.08 | 1 | 1 | 0 | 0 | 0 | 4.1 | 3 | 1 | 0 | 2 | 2 |
| Héctor Ortíz | 1960-1960 | 0 | 0 | .000 | 14.40 | 3 | 0 | 0 | 0 | 0 | 5.0 | 12 | 8 | 1 | 9 | 1 |
| Luis Ortíz | 1972-1972 | 0 | 2 | .000 | 15.19 | 2 | 2 | 0 | 0 | 0 | 5.1 | 14 | 9 | 0 | 5 | 2 |
| Tsuruki Ota | 1960-1964 | 0 | 0 | .000 | 10.00 | 6 | 0 | 0 | 0 | 1 | 9.0 | 11 | 10 | 2 | 8 | 3 |
| Rafael Otero | 1980-1980 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 2 | 2.0 | 0 | 0 | 0 | 0 | 3 |
| Mirko Otoupalik | 1968-1968 | 0 | 0 | .000 | 16.62 | 3 | 0 | 0 | 0 | 0 | 4.1 | 12 | 8 | 0 | 7 | 2 |
| Kazuyuki Otsuka | 1984-1984 | 0 | 1 | .000 | 16.88 | 3 | 0 | 0 | 0 | 0 | 2.2 | 2 | 5 | 1 | 5 | 3 |
| Malaki Ouakili | 1988-1988 | 0 | 0 | .000 | 12.00 | 3 | 0 | 0 | 0 | 0 | 6.0 | 12 | 8 | 0 | 7 | 5 |
| Karel Oude Nijhuis | 1976-1976 | 0 | 0 | .000 | 0.00 | 4 | 0 | 0 | 0 | 3 | 5.0 | 2 | 0 | 0 | 3 | 4 |
| Demy Ouwendijk | 1972-1972 | 1 | 1 | .500 | 4.50 | 2 | 2 | 0 | 0 | 0 | 14.0 | 17 | 7 | 1 | 2 | 4 |
| Helal Owoduni | 1964-1968 | 2 | 3 | .400 | 12.10 | 6 | 6 | 0 | 0 | 0 | 19.1 | 28 | 26 | 3 | 16 | 7 |
