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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 |
|---|---|---|---|---|---|---|---|---|---|
| Danny O'Brien | 1988-1988 | .227 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Hanraghan | 1984-1984 | .280 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Osano Obayana | 1988-1988 | .000 | 0 | 0 | 0 | 0 | 2 | 0.00 | 2 |
| Junior Ocasio | 1980-1984 | .107 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Noriyuki Ochiai | 1988-1988 | .000 | 0 | 0 | 0 | 0 | 2 | 1.23 | 5 |
| Melesse Odindo | 1984-1988 | .143 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Charlie Ogden | 1964-1964 | .000 | 0 | 0 | 0 | 1 | 0 | 13.50 | 1 |
| Cisco Ogegeda | 1972-1972 | .000 | 0 | 0 | 0 | 0 | 0 | 4.50 | 1 |
| Robbie Ohon | 1984-1988 | .000 | 0 | 0 | 1 | 1 | 0 | 4.91 | 10 |
| Wolde Ohon | 1988-1988 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Degife Ola | 1968-1968 | .000 | 0 | 0 | 0 | 1 | 0 | 16.78 | 3 |
| Vicente Olivaocs | 1976-1976 | .391 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Olvera | 1980-1980 | .000 | 0 | 0 | 0 | 2 | 0 | 4.66 | 6 |
| Mesfin Omaswa | 1984-1988 | .241 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Eskinder Omondi | 1964-1968 | .000 | 0 | 0 | 1 | 1 | 3 | 7.59 | 9 |
| Diego Ontiveros | 1988-1988 | .160 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Gjelt Oort | 1980-1980 | .333 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Cesar Ooyendijk | 1968-1968 | .000 | 0 | 0 | 0 | 0 | 0 | 2.25 | 0 |
| Klaus Opsteegh | 1980-1980 | .400 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Stone Oram | 1972-1972 | .667 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| António Ortega | 1972-1972 | .000 | 0 | 0 | 0 | 0 | 1 | 17.18 | 1 |
| Juan Ortega | 1960-1960 | .000 | 0 | 0 | 0 | 0 | 0 | 8.44 | 1 |
| Miguel Ortega | 1968-1968 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ángel Ortíz | 1968-1968 | .000 | 0 | 0 | 0 | 0 | 1 | 3.38 | 8 |
| Dani Ortíz | 1984-1984 | .000 | 0 | 0 | 0 | 0 | 0 | 2.08 | 2 |
| Emílio Ortíz | 1960-1960 | .304 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ortíz | 1976-1976 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Héctor Ortíz | 1976-1976 | .200 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Héctor Ortíz | 1960-1960 | .000 | 0 | 0 | 0 | 0 | 0 | 14.40 | 1 |
| Luis Ortíz | 1972-1972 | .000 | 0 | 0 | 0 | 2 | 0 | 15.19 | 2 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Martín Ortíz | 1988-1988 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ricardo Ortíz | 1988-1988 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Ortíz | 1988-1988 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tsuruki Ota | 1960-1964 | .000 | 0 | 0 | 0 | 0 | 1 | 10.00 | 3 |
| Rafael Otero | 1980-1980 | .000 | 0 | 0 | 0 | 0 | 2 | 0.00 | 3 |
| Mirko Otoupalik | 1968-1968 | .000 | 0 | 0 | 0 | 0 | 0 | 16.62 | 2 |
| Kazuyuki Otsuka | 1984-1984 | .000 | 0 | 0 | 0 | 1 | 0 | 16.88 | 3 |
| Malaki Ouakili | 1988-1988 | .000 | 0 | 0 | 0 | 0 | 0 | 12.00 | 5 |
| Karel Oude Nijhuis | 1976-1976 | .000 | 0 | 0 | 0 | 0 | 3 | 0.00 | 4 |
| Demy Ouwendijk | 1972-1972 | .000 | 0 | 0 | 1 | 1 | 0 | 4.50 | 4 |
| Steven Ouwendijk | 1972-1980 | .167 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Hemmu Owiti | 1988-1988 | .179 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Helal Owoduni | 1964-1968 | .000 | 0 | 0 | 2 | 3 | 0 | 12.10 | 7 |
