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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Darragh O'Loughlin | 2046-2049 | 1 | 4 | .200 | 3.96 | 27 | 0 | 0 | 0 | 4 | 61.1 | 45 | 27 | 9 | 16 | 83 |
| Rick Oakes | 2051-2051 | 1 | 1 | .500 | 8.16 | 8 | 0 | 0 | 0 | 0 | 14.1 | 15 | 13 | 2 | 8 | 4 |
| Craig Obray | 2047-2047 | 0 | 0 | .000 | 0.00 | 3 | 0 | 0 | 0 | 0 | 6.0 | 6 | 0 | 0 | 3 | 6 |
| Vicente Ocasio | 2043-2043 | 0 | 1 | .000 | 6.48 | 5 | 5 | 0 | 0 | 0 | 25.0 | 31 | 18 | 6 | 9 | 24 |
| Iskinder Okoth | 2043-2044 | 7 | 10 | .412 | 5.42 | 20 | 19 | 1 | 1 | 0 | 93.0 | 94 | 56 | 14 | 31 | 74 |
| Manobu Okumura | 2055-2058 | 20 | 6 | .769 | 1.84 | 42 | 30 | 1 | 1 | 3 | 205.0 | 125 | 42 | 9 | 51 | 193 |
| Juan Olivarez | 2043-2043 | 1 | 3 | .250 | 3.49 | 25 | 0 | 0 | 0 | 12 | 28.1 | 24 | 11 | 4 | 7 | 27 |
| Roberto Olivarez | 2050-2050 | 1 | 0 | 1.000 | 5.11 | 6 | 0 | 0 | 0 | 2 | 12.1 | 11 | 7 | 0 | 8 | 10 |
| Javier Olivas | 2049-2052 | 10 | 5 | .667 | 5.18 | 49 | 3 | 1 | 0 | 3 | 132.0 | 147 | 76 | 17 | 71 | 97 |
| Sébastien Olivier | 2053-2054 | 4 | 2 | .667 | 2.41 | 26 | 0 | 0 | 0 | 2 | 37.1 | 31 | 10 | 0 | 11 | 37 |
| Enrique Olvera | 2044-2044 | 0 | 0 | .000 | 4.63 | 5 | 0 | 0 | 0 | 1 | 11.2 | 10 | 6 | 1 | 8 | 3 |
| Abdul-Shakur Omar | 2047-2050 | 6 | 13 | .316 | 3.67 | 41 | 14 | 3 | 1 | 0 | 137.1 | 146 | 56 | 15 | 35 | 138 |
| Slobodan Omeragic | 2045-2047 | 10 | 9 | .526 | 4.97 | 46 | 40 | 0 | 0 | 0 | 190.0 | 200 | 105 | 19 | 80 | 180 |
| Kaliu Oola | 2050-2052 | 10 | 11 | .476 | 5.10 | 36 | 36 | 1 | 1 | 0 | 185.1 | 189 | 105 | 21 | 56 | 178 |
| Jacob Oort | 2043-2043 | 1 | 0 | 1.000 | 5.40 | 4 | 4 | 0 | 0 | 0 | 18.1 | 25 | 11 | 2 | 2 | 16 |
| Zeheb Orga | 2055-2058 | 12 | 2 | .857 | 4.06 | 42 | 13 | 1 | 1 | 4 | 155.0 | 160 | 70 | 11 | 53 | 85 |
| Paco Orozco | 2055-2058 | 2 | 10 | .167 | 5.66 | 89 | 6 | 0 | 0 | 5 | 162.1 | 187 | 102 | 29 | 83 | 71 |
| António Ortíz | 2047-2047 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.1 | 1 | 0 | 0 | 1 | 1 |
| Francisco Ortíz | 2045-2045 | 2 | 5 | .286 | 22.67 | 28 | 0 | 0 | 0 | 0 | 35.1 | 81 | 89 | 22 | 53 | 27 |
| Iván Ortíz | 2043-2043 | 1 | 0 | 1.000 | 5.23 | 6 | 2 | 0 | 0 | 0 | 10.1 | 10 | 6 | 1 | 8 | 15 |
| Orlando Ortíz | 2052-2052 | 0 | 2 | .000 | 5.40 | 2 | 2 | 0 | 0 | 0 | 11.2 | 10 | 7 | 4 | 6 | 9 |
| Ricardo Osorio | 2046-2056 | 7 | 7 | .500 | 4.46 | 39 | 22 | 2 | 2 | 0 | 155.1 | 168 | 77 | 13 | 27 | 140 |
| Roderick Ottaway | 2043-2043 | 1 | 2 | .333 | 6.50 | 4 | 4 | 0 | 0 | 0 | 18.0 | 14 | 13 | 1 | 11 | 12 |
| Gah-fat Ou-yang | 2050-2050 | 2 | 7 | .222 | 6.32 | 14 | 14 | 0 | 0 | 0 | 74.0 | 101 | 52 | 16 | 26 | 61 |
| Hou-kang Ouyang | 2050-2050 | 1 | 0 | 1.000 | 2.70 | 1 | 0 | 0 | 0 | 0 | 3.1 | 2 | 1 | 0 | 1 | 3 |
| Kei Ozaki | 2047-2047 | 6 | 1 | .857 | 1.65 | 8 | 8 | 0 | 0 | 0 | 54.2 | 49 | 10 | 5 | 10 | 51 |
