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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Billy O'Brien | 2030-2032 | .335 | 4 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Brien | 2031-2031 | .000 | 0 | 0 | 0 | 0 | 0 | 22.95 | 6 |
| Chris O'Leary | 2030-2032 | .292 | 29 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| David O'Neil | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 7.20 | 19 |
| Bob O'Neill | 2031-2032 | .000 | 0 | 0 | 5 | 1 | 0 | 7.90 | 70 |
| Don Ohler | 2030-2032 | .284 | 12 | 90 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Olheiser | 2031-2032 | .000 | 0 | 0 | 1 | 1 | 0 | 6.64 | 22 |
| Matt Olson | 2031-2032 | .000 | 0 | 0 | 4 | 3 | 0 | 5.63 | 64 |
| Nate Oncale | 2030-2032 | .324 | 7 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Ornelas | 2031-2032 | .000 | 0 | 0 | 0 | 2 | 0 | 9.50 | 20 |
| Rich Orr | 2030-2031 | .667 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Osburn | 2030-2032 | .228 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Osburn | 2032-2032 | .000 | 0 | 0 | 0 | 0 | 0 | 3.60 | 3 |
| Erik Osgood | 2030-2032 | .176 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Takeshi Osumi | 2030-2031 | .000 | 0 | 0 | 4 | 2 | 4 | 6.00 | 58 |
| David Otterstrom | 2030-2032 | .302 | 37 | 156 | 0 | 0 | 0 | 0.00 | 0 |
| David Owens | 2030-2032 | .000 | 0 | 0 | 16 | 13 | 0 | 6.50 | 238 |
| Yodo Oyama | 2030-2032 | .000 | 0 | 0 | 4 | 6 | 27 | 4.39 | 86 |
