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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sung-tae O | 2038-2038 | 3 | 5 | .375 | 4.65 | 18 | 13 | 0 | 0 | 0 | 62.0 | 84 | 32 | 0 | 21 | 45 |
| Alex O'Dell | 2035-2036 | 3 | 4 | .429 | 2.48 | 43 | 2 | 0 | 0 | 1 | 65.1 | 63 | 18 | 4 | 11 | 80 |
| Melvin O'Herlihy | 2032-2032 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.1 | 1 | 0 | 0 | 2 | 1 |
| Dave O'Neil | 2038-2038 | 2 | 1 | .667 | 0.22 | 5 | 5 | 1 | 1 | 0 | 40.1 | 22 | 1 | 1 | 2 | 38 |
| Johnny O'Quinn | 2032-2032 | 7 | 5 | .583 | 3.99 | 13 | 13 | 1 | 0 | 0 | 94.2 | 114 | 42 | 9 | 26 | 87 |
| Eric O'Slattery | 2038-2038 | 4 | 5 | .444 | 2.69 | 20 | 8 | 1 | 0 | 6 | 63.2 | 60 | 19 | 3 | 20 | 45 |
| Jorge Ochoa | 2032-2032 | 3 | 4 | .429 | 2.35 | 29 | 0 | 0 | 0 | 12 | 30.2 | 31 | 8 | 1 | 9 | 50 |
| Romochka Oistrah | 2038-2038 | 1 | 0 | 1.000 | 1.80 | 6 | 0 | 0 | 0 | 2 | 20.0 | 13 | 4 | 1 | 4 | 20 |
| Hidekazu Okawa | 2032-2032 | 6 | 5 | .545 | 4.94 | 13 | 13 | 1 | 0 | 0 | 71.0 | 89 | 39 | 3 | 16 | 57 |
| Abdul-Salam Omar | 2032-2034 | 9 | 5 | .643 | 2.67 | 41 | 11 | 2 | 1 | 2 | 145.0 | 118 | 43 | 9 | 44 | 170 |
| Yoritoki Onodera | 2036-2037 | 3 | 4 | .429 | 3.20 | 47 | 0 | 0 | 0 | 5 | 81.2 | 92 | 29 | 5 | 33 | 65 |
| Gijsbert Oostenbroek | 2033-2034 | 2 | 0 | 1.000 | 3.12 | 16 | 2 | 0 | 0 | 3 | 40.1 | 38 | 14 | 2 | 12 | 40 |
| Gerald Orlebar | 2033-2034 | 17 | 18 | .486 | 3.94 | 44 | 43 | 10 | 2 | 1 | 317.1 | 382 | 139 | 20 | 82 | 264 |
| Carlos Ortega | 2038-2038 | 5 | 2 | .714 | 2.70 | 29 | 4 | 1 | 0 | 7 | 56.2 | 49 | 17 | 4 | 14 | 73 |
| Ánibal Ortíz | 2033-2033 | 2 | 0 | 1.000 | 2.43 | 17 | 1 | 0 | 0 | 0 | 40.2 | 37 | 11 | 3 | 12 | 56 |
| Aurelio Ortíz | 2032-2035 | 20 | 15 | .571 | 4.00 | 82 | 32 | 0 | 0 | 14 | 274.2 | 286 | 122 | 21 | 71 | 359 |
| Eduardo Ortíz | 2038-2038 | 0 | 1 | .000 | 10.80 | 1 | 0 | 0 | 0 | 0 | 1.2 | 2 | 2 | 0 | 1 | 0 |
| Félix Ortíz | 2038-2038 | 6 | 10 | .375 | 4.56 | 23 | 22 | 0 | 0 | 0 | 126.1 | 148 | 64 | 7 | 36 | 111 |
| Francisco Ortíz | 2032-2033 | 4 | 2 | .667 | 3.86 | 15 | 10 | 1 | 1 | 0 | 70.0 | 83 | 30 | 8 | 15 | 72 |
| Jesús Ortíz | 2036-2036 | 3 | 1 | .750 | 5.20 | 28 | 0 | 0 | 0 | 0 | 64.0 | 97 | 37 | 6 | 18 | 48 |
| Royce Ortíz | 2034-2034 | 3 | 0 | 1.000 | 2.33 | 16 | 0 | 0 | 0 | 0 | 38.2 | 39 | 10 | 2 | 10 | 59 |
| Bungay Osiman | 2038-2038 | 6 | 5 | .545 | 2.78 | 16 | 12 | 0 | 0 | 1 | 87.1 | 77 | 27 | 4 | 26 | 62 |
| Ralph Owens | 2033-2035 | 7 | 10 | .412 | 3.91 | 34 | 27 | 0 | 0 | 1 | 163.1 | 162 | 71 | 8 | 53 | 170 |
| Tim Owens | 2036-2036 | 0 | 3 | .000 | 4.04 | 6 | 6 | 0 | 0 | 0 | 35.2 | 46 | 16 | 2 | 8 | 23 |
| Jorge Oyas | 2032-2032 | 10 | 7 | .588 | 4.18 | 28 | 19 | 1 | 0 | 0 | 125.0 | 142 | 58 | 6 | 35 | 108 |
