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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Russ O'Fahy | 1988-1988 | 1 | 1 | .500 | 3.20 | 4 | 4 | 0 | 0 | 0 | 25.1 | 20 | 9 | 4 | 6 | 24 |
| McGrath O'Malley | 1984-1988 | 0 | 0 | .000 | 5.93 | 4 | 2 | 0 | 0 | 1 | 13.2 | 15 | 9 | 1 | 7 | 13 |
| Kirby O'Meenan | 1958-1964 | 0 | 1 | .000 | 6.68 | 11 | 4 | 0 | 0 | 0 | 33.2 | 32 | 25 | 4 | 36 | 28 |
| Tony Ocasio | 1967-1967 | 1 | 0 | 1.000 | 13.50 | 1 | 0 | 0 | 0 | 0 | 2.0 | 3 | 3 | 2 | 2 | 1 |
| Dwaine Ockey | 1970-1973 | 0 | 0 | .000 | 1.29 | 11 | 0 | 0 | 0 | 1 | 21.0 | 18 | 3 | 1 | 2 | 13 |
| Hakizimana Odour | 1961-1973 | 2 | 6 | .250 | 6.01 | 22 | 9 | 1 | 0 | 1 | 79.1 | 71 | 53 | 5 | 53 | 56 |
| Cisco Ogegeda | 1981-1981 | 0 | 1 | .000 | 7.47 | 5 | 5 | 0 | 0 | 0 | 15.2 | 20 | 13 | 2 | 12 | 7 |
| Matunde Ogonna | 1964-1970 | 1 | 1 | .500 | 7.45 | 12 | 0 | 0 | 0 | 0 | 19.1 | 21 | 16 | 5 | 13 | 23 |
| Takakazu Ohayashi | 1973-1981 | 3 | 2 | .600 | 4.04 | 14 | 7 | 0 | 0 | 0 | 55.2 | 52 | 25 | 6 | 26 | 37 |
| Kyoichi Oike | 1988-1988 | 0 | 0 | .000 | 2.45 | 5 | 0 | 0 | 0 | 2 | 7.1 | 4 | 2 | 0 | 4 | 15 |
| Otso Ojanen | 1981-1981 | 1 | 0 | 1.000 | 13.50 | 2 | 0 | 0 | 0 | 0 | 4.0 | 4 | 6 | 1 | 6 | 1 |
| Suketsune Okada | 1958-1958 | 1 | 0 | 1.000 | 3.21 | 7 | 0 | 0 | 0 | 1 | 14.0 | 15 | 5 | 2 | 10 | 14 |
| Motoshige Okazaki | 1958-1958 | 0 | 1 | .000 | 10.13 | 2 | 0 | 0 | 0 | 0 | 2.2 | 5 | 3 | 0 | 2 | 2 |
| Meqwran Oko | 1964-1964 | 0 | 0 | .000 | 5.40 | 1 | 0 | 0 | 0 | 0 | 1.2 | 1 | 1 | 0 | 3 | 0 |
| Degife Ola | 1967-1967 | 1 | 1 | .500 | 7.88 | 2 | 2 | 1 | 0 | 0 | 16.0 | 24 | 14 | 3 | 10 | 4 |
| Kiril Olieman | 1988-1988 | 1 | 0 | 1.000 | 2.84 | 2 | 2 | 0 | 0 | 0 | 12.2 | 6 | 4 | 0 | 8 | 15 |
| Ernesto Oliveira | 1958-1958 | 0 | 0 | .000 | 2.70 | 1 | 0 | 0 | 0 | 0 | 3.1 | 1 | 1 | 0 | 2 | 1 |
| Manuel Olthuis | 1961-1964 | 0 | 3 | .000 | 15.26 | 7 | 2 | 0 | 0 | 2 | 15.1 | 18 | 26 | 4 | 17 | 12 |
| Itri Olu | 1984-1988 | 0 | 1 | .000 | 2.45 | 11 | 0 | 0 | 0 | 1 | 14.2 | 14 | 4 | 2 | 9 | 12 |
| Amin Oluniide | 1981-1988 | 1 | 3 | .250 | 4.31 | 10 | 7 | 0 | 0 | 2 | 54.1 | 51 | 26 | 4 | 13 | 45 |
| Sayid Omar | 1981-1981 | 0 | 1 | .000 | 6.55 | 4 | 1 | 0 | 0 | 0 | 11.0 | 19 | 8 | 0 | 5 | 6 |
| Zigza Onkwani | 1964-1970 | 0 | 0 | .000 | 10.47 | 10 | 0 | 0 | 0 | 0 | 16.1 | 21 | 19 | 4 | 11 | 11 |
| Kimi Ono | 1988-1988 | 0 | 0 | .000 | 4.91 | 2 | 0 | 0 | 0 | 0 | 3.2 | 3 | 2 | 0 | 2 | 6 |
| Junji Onodera | 1967-1977 | 7 | 7 | .500 | 3.21 | 15 | 11 | 6 | 2 | 1 | 98.0 | 88 | 35 | 8 | 34 | 53 |
| Tekle-Haymanot Onyebuchi | 1984-1988 | 0 | 3 | .000 | 6.91 | 10 | 0 | 0 | 0 | 1 | 14.1 | 14 | 11 | 2 | 13 | 16 |
| Harrie Oolbekkink | 1958-1967 | 1 | 3 | .250 | 14.76 | 13 | 3 | 0 | 0 | 1 | 25.0 | 43 | 41 | 6 | 39 | 20 |
| Filip Ooyendijk | 1958-1958 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 1 | 0 | 0 | 0 | 2 |
| Júlio Orozco | 1958-1970 | 5 | 5 | .500 | 5.98 | 25 | 3 | 0 | 0 | 4 | 61.2 | 67 | 41 | 6 | 30 | 31 |
| Francisco Ortega | 1981-1984 | 1 | 1 | .500 | 2.35 | 3 | 2 | 0 | 0 | 0 | 15.1 | 10 | 4 | 1 | 7 | 12 |
| Juan Ortega | 1970-1970 | 0 | 0 | .000 | 2.00 | 7 | 0 | 0 | 0 | 2 | 9.0 | 7 | 2 | 0 | 5 | 8 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Manuel Ortega | 1958-1964 | 1 | 1 | .500 | 9.14 | 12 | 0 | 0 | 0 | 1 | 21.2 | 30 | 22 | 2 | 14 | 23 |
| Anastasio Ortíz | 1977-1977 | 0 | 0 | .000 | 1.69 | 3 | 0 | 0 | 0 | 0 | 5.1 | 4 | 1 | 0 | 8 | 1 |
| Ángel Ortíz | 1977-1977 | 0 | 0 | .000 | 6.75 | 3 | 0 | 0 | 0 | 0 | 5.1 | 6 | 4 | 0 | 7 | 3 |
| Carlos Ortíz | 1984-1988 | 5 | 1 | .833 | 1.96 | 13 | 6 | 2 | 2 | 3 | 55.0 | 28 | 12 | 2 | 14 | 44 |
| Edgardo Ortíz | 1981-1988 | 2 | 1 | .667 | 3.75 | 14 | 6 | 1 | 0 | 0 | 57.2 | 62 | 24 | 3 | 13 | 20 |
| José Ortíz | 1970-1973 | 0 | 0 | .000 | 8.53 | 4 | 0 | 0 | 0 | 0 | 6.1 | 11 | 6 | 2 | 3 | 4 |
| Oliver Ortíz | 1988-1988 | 0 | 0 | .000 | 1.35 | 5 | 0 | 0 | 0 | 0 | 13.1 | 8 | 2 | 1 | 5 | 12 |
| Víctor Ortíz | 1961-1961 | 0 | 0 | .000 | 21.41 | 4 | 0 | 0 | 0 | 0 | 9.2 | 22 | 23 | 4 | 11 | 2 |
| Tsuginori Osada | 1981-1988 | 4 | 6 | .400 | 2.97 | 13 | 12 | 1 | 0 | 1 | 78.2 | 67 | 26 | 8 | 16 | 72 |
| Félix Osorio | 1958-1970 | 9 | 3 | .750 | 3.61 | 19 | 14 | 1 | 0 | 0 | 104.2 | 100 | 42 | 13 | 30 | 87 |
| César Otero | 1984-1988 | 0 | 0 | .000 | 3.52 | 4 | 0 | 0 | 0 | 1 | 7.2 | 6 | 3 | 0 | 4 | 7 |
| Cor Ottens | 1961-1970 | 0 | 1 | .000 | 10.29 | 11 | 0 | 0 | 0 | 3 | 14.0 | 25 | 16 | 2 | 10 | 5 |
| Bryan Oulton | 1964-1964 | 2 | 0 | 1.000 | 5.48 | 4 | 3 | 0 | 0 | 0 | 21.1 | 21 | 13 | 2 | 12 | 21 |
| Oukesson Ouma | 1984-1984 | 0 | 2 | .000 | 24.55 | 3 | 2 | 0 | 0 | 0 | 7.1 | 18 | 20 | 2 | 11 | 1 |
| Demy Ouwendijk | 1977-1988 | 5 | 4 | .556 | 2.56 | 30 | 0 | 0 | 0 | 10 | 45.2 | 42 | 13 | 0 | 22 | 35 |
| Sinclair Overbeek | 1977-1977 | 0 | 0 | .000 | 2.08 | 2 | 1 | 0 | 0 | 0 | 8.2 | 7 | 2 | 1 | 3 | 9 |
| Urs Oversluizen | 1981-1981 | 2 | 1 | .667 | 3.98 | 3 | 3 | 0 | 0 | 0 | 20.1 | 20 | 9 | 0 | 8 | 13 |
| Yaroslav Ovshinov | 1981-1981 | 1 | 1 | .500 | 9.45 | 6 | 0 | 0 | 0 | 1 | 6.2 | 9 | 7 | 1 | 4 | 2 |
| Helal Owoduni | 1970-1984 | 4 | 4 | .500 | 2.90 | 22 | 8 | 0 | 0 | 4 | 62.0 | 58 | 20 | 1 | 31 | 39 |
| Sin Owuor | 1984-1984 | 0 | 0 | .000 | 15.88 | 10 | 0 | 0 | 0 | 0 | 11.1 | 24 | 20 | 2 | 16 | 7 |
| Baha Özergin | 1961-1964 | 1 | 1 | .500 | 6.19 | 8 | 0 | 0 | 0 | 1 | 16.0 | 23 | 11 | 2 | 9 | 7 |
