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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| David O'Farrell | 2053-2053 | 2 | 1 | .667 | 1.80 | 20 | 0 | 0 | 0 | 9 | 25.0 | 19 | 5 | 0 | 7 | 21 |
| Pavel Ofitserov | 2048-2048 | 1 | 4 | .200 | 7.50 | 13 | 0 | 0 | 0 | 5 | 12.0 | 20 | 10 | 2 | 5 | 13 |
| Erik Ogilko | 2056-2056 | 0 | 0 | .000 | 3.86 | 11 | 0 | 0 | 0 | 0 | 16.1 | 14 | 7 | 3 | 9 | 20 |
| Kamuela Okilani | 2055-2056 | 1 | 1 | .500 | 2.64 | 15 | 0 | 0 | 0 | 0 | 30.2 | 32 | 9 | 7 | 8 | 34 |
| Dean Oldknow | 2051-2051 | 2 | 3 | .400 | 2.60 | 12 | 0 | 0 | 0 | 1 | 27.2 | 22 | 8 | 6 | 16 | 28 |
| Octávio Olivaies | 2049-2049 | 4 | 6 | .400 | 9.56 | 15 | 15 | 0 | 0 | 0 | 64.0 | 128 | 68 | 6 | 18 | 22 |
| Larry Oliver | 2052-2052 | 1 | 1 | .500 | 3.29 | 2 | 2 | 0 | 0 | 0 | 13.2 | 7 | 5 | 2 | 3 | 16 |
| Wu-shiun Ong | 2058-2059 | 5 | 3 | .625 | 2.12 | 12 | 12 | 0 | 0 | 0 | 63.2 | 68 | 15 | 4 | 12 | 55 |
| Stuart Oolbekkink | 2056-2056 | 0 | 1 | .000 | 3.65 | 8 | 0 | 0 | 0 | 1 | 12.1 | 11 | 5 | 4 | 5 | 7 |
| Nils Oostermeer | 2048-2048 | 0 | 0 | .000 | 3.18 | 11 | 0 | 0 | 0 | 0 | 22.2 | 27 | 8 | 0 | 10 | 19 |
| Cameron Oram | 2056-2057 | 2 | 2 | .500 | 5.06 | 13 | 0 | 0 | 0 | 2 | 32.0 | 25 | 18 | 6 | 11 | 25 |
| John Oram | 2052-2054 | 3 | 2 | .600 | 4.58 | 38 | 1 | 0 | 0 | 3 | 57.0 | 56 | 29 | 8 | 15 | 73 |
| Keneki Orana | 2049-2049 | 0 | 0 | .000 | 2.05 | 11 | 0 | 0 | 0 | 1 | 22.0 | 29 | 5 | 1 | 4 | 9 |
| Francisco Ornelas | 2055-2055 | 0 | 0 | .000 | 5.40 | 1 | 0 | 0 | 0 | 0 | 3.1 | 4 | 2 | 1 | 3 | 3 |
| Nicholas Orr | 2051-2051 | 3 | 5 | .375 | 3.20 | 19 | 0 | 0 | 0 | 5 | 25.1 | 17 | 9 | 5 | 6 | 32 |
| Carlos Ortega | 2057-2059 | 7 | 13 | .350 | 3.64 | 31 | 23 | 1 | 0 | 3 | 148.1 | 135 | 60 | 25 | 55 | 119 |
| Carlos Ortega | 2057-2057 | 1 | 1 | .500 | 9.00 | 6 | 0 | 0 | 0 | 0 | 11.0 | 15 | 11 | 3 | 1 | 3 |
| Fernando Ortega | 2055-2055 | 1 | 4 | .200 | 3.00 | 22 | 0 | 0 | 0 | 2 | 24.0 | 19 | 8 | 5 | 9 | 25 |
| Vicente Ortíz | 2048-2048 | 2 | 0 | 1.000 | 5.57 | 11 | 0 | 0 | 0 | 1 | 21.0 | 31 | 13 | 0 | 6 | 9 |
| Kunisada Osawa | 2052-2053 | 1 | 2 | .333 | 2.53 | 20 | 0 | 0 | 0 | 5 | 32.0 | 21 | 9 | 3 | 11 | 28 |
| Kuniyuki Ota | 2050-2051 | 9 | 4 | .692 | 4.53 | 52 | 11 | 0 | 0 | 3 | 117.1 | 131 | 59 | 19 | 30 | 129 |
| Esteban Otero | 2055-2055 | 0 | 1 | .000 | 10.12 | 4 | 0 | 0 | 0 | 0 | 5.1 | 8 | 6 | 2 | 0 | 7 |
| Kien Ou-yang | 2053-2054 | 6 | 4 | .600 | 2.90 | 18 | 13 | 0 | 0 | 2 | 93.0 | 93 | 30 | 6 | 21 | 78 |
| Ching-wei Ouyang | 2052-2053 | 0 | 2 | .000 | 4.18 | 10 | 0 | 0 | 0 | 1 | 23.2 | 33 | 11 | 1 | 10 | 25 |
| Tuo-zhou Ow | 2056-2057 | 4 | 4 | .500 | 4.52 | 27 | 5 | 0 | 0 | 4 | 71.2 | 74 | 36 | 11 | 23 | 66 |
| Brant Owens | 2052-2053 | 4 | 7 | .364 | 4.35 | 19 | 16 | 0 | 0 | 0 | 89.0 | 84 | 43 | 22 | 35 | 95 |
| Francis Owens | 2054-2054 | 1 | 2 | .333 | 3.38 | 6 | 6 | 0 | 0 | 0 | 29.1 | 22 | 11 | 7 | 7 | 31 |
| Craig Oyler | 2052-2052 | 0 | 0 | .000 | 2.97 | 14 | 0 | 0 | 0 | 1 | 30.1 | 18 | 10 | 6 | 10 | 35 |
