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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 |
| 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 |
| Nils Oostermeer | 2048-2048 | 0 | 0 | .000 | 3.18 | 11 | 0 | 0 | 0 | 0 | 22.2 | 27 | 8 | 0 | 10 | 19 |
| John Oram | 2052-2053 | 3 | 2 | .600 | 4.67 | 30 | 1 | 0 | 0 | 3 | 44.1 | 43 | 23 | 6 | 12 | 57 |
| Keneki Orana | 2049-2049 | 0 | 0 | .000 | 2.05 | 11 | 0 | 0 | 0 | 1 | 22.0 | 29 | 5 | 1 | 4 | 9 |
| Nicholas Orr | 2051-2051 | 3 | 5 | .375 | 3.20 | 19 | 0 | 0 | 0 | 5 | 25.1 | 17 | 9 | 5 | 6 | 32 |
| 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 |
| Kien Ou-yang | 2053-2054 | 1 | 1 | .500 | 3.18 | 7 | 2 | 0 | 0 | 2 | 17.0 | 20 | 6 | 1 | 3 | 17 |
| Ching-wei Ouyang | 2052-2053 | 0 | 2 | .000 | 4.18 | 10 | 0 | 0 | 0 | 1 | 23.2 | 33 | 11 | 1 | 10 | 25 |
| 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 | 0 | 1.000 | 0.00 | 1 | 1 | 0 | 0 | 0 | 6.0 | 3 | 0 | 0 | 1 | 5 |
| Craig Oyler | 2052-2052 | 0 | 0 | .000 | 2.97 | 14 | 0 | 0 | 0 | 1 | 30.1 | 18 | 10 | 6 | 10 | 35 |
