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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kevin O'Brian | 2052-2064 | 22 | 22 | .500 | 4.36 | 183 | 34 | 1 | 0 | 11 | 437.2 | 472 | 212 | 27 | 154 | 239 |
| Jerry O'Bryan | 2062-2064 | 21 | 27 | .438 | 4.28 | 92 | 46 | 1 | 0 | 16 | 334.2 | 338 | 159 | 34 | 99 | 333 |
| Shawn O'Reilly | 2054-2062 | 31 | 30 | .508 | 3.98 | 167 | 45 | 1 | 0 | 19 | 415.2 | 380 | 184 | 51 | 139 | 529 |
| Jared Oberdick | 2062-2064 | 0 | 2 | .000 | 3.82 | 14 | 1 | 0 | 0 | 1 | 33.0 | 17 | 14 | 4 | 19 | 45 |
| Sal Ochoa | 2063-2064 | 3 | 1 | .750 | 4.81 | 30 | 5 | 0 | 0 | 0 | 76.2 | 65 | 41 | 10 | 45 | 95 |
| Keizo Ohayashi | 2057-2060 | 7 | 3 | .700 | 2.94 | 15 | 14 | 0 | 0 | 0 | 95.0 | 80 | 31 | 8 | 26 | 62 |
| Kazuya Okumura | 2062-2062 | 2 | 2 | .500 | 5.12 | 6 | 6 | 0 | 0 | 0 | 31.2 | 33 | 18 | 7 | 15 | 30 |
| Jorge Orozco | 2053-2057 | 9 | 9 | .500 | 4.87 | 35 | 31 | 0 | 0 | 0 | 170.0 | 188 | 92 | 11 | 46 | 85 |
| Alfredo OrtÃz | 2054-2063 | 9 | 10 | .474 | 4.10 | 53 | 31 | 1 | 1 | 2 | 208.1 | 193 | 95 | 23 | 103 | 154 |
| Shinkichi Ota | 2064-2064 | 8 | 9 | .471 | 4.22 | 24 | 24 | 1 | 0 | 0 | 153.2 | 134 | 72 | 7 | 77 | 162 |
| Chris Owens | 2063-2063 | 0 | 1 | .000 | 3.86 | 17 | 3 | 0 | 0 | 0 | 39.2 | 40 | 17 | 6 | 13 | 41 |
