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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 | 2030-2033 | .338 | 7 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| David O'Neil | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 7.20 | 19 |
| Bob O'Neill | 2031-2033 | .000 | 0 | 0 | 6 | 2 | 1 | 8.24 | 107 |
| Dillon Oatman | 2034-2034 | .000 | 0 | 0 | 1 | 0 | 0 | 1.86 | 18 |
| Tony Ochoa | 2034-2034 | .000 | 0 | 0 | 2 | 1 | 0 | 5.54 | 12 |
| Vince Oler | 2034-2034 | .000 | 0 | 0 | 0 | 0 | 0 | 1.00 | 9 |
| Ben Olheiser | 2031-2033 | .000 | 0 | 0 | 2 | 1 | 1 | 7.33 | 42 |
| Nelson Olivas | 2034-2034 | .316 | 2 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby Olsen | 2033-2034 | .291 | 6 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Jacob Olsen | 2033-2034 | .000 | 0 | 0 | 10 | 5 | 0 | 3.46 | 224 |
| Josh Olson | 2034-2034 | .000 | 0 | 0 | 2 | 4 | 0 | 8.46 | 60 |
| Matt Olson | 2031-2032 | .000 | 0 | 0 | 4 | 3 | 0 | 5.63 | 64 |
| Nate Oncale | 2030-2033 | .343 | 23 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Ornelas | 2031-2032 | .000 | 0 | 0 | 0 | 2 | 0 | 9.50 | 20 |
| Mike Orner | 2034-2034 | .000 | 0 | 0 | 1 | 0 | 1 | 2.84 | 11 |
| Rich Orr | 2030-2031 | .667 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Julio Ortiz | 2034-2034 | .000 | 0 | 0 | 1 | 1 | 0 | 9.00 | 24 |
| Mike Osburn | 2032-2033 | .000 | 0 | 0 | 1 | 0 | 1 | 5.27 | 27 |
| Erik Osgood | 2030-2033 | .301 | 4 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Takeshi Osumi | 2030-2031 | .000 | 0 | 0 | 4 | 2 | 4 | 6.00 | 58 |
| David Otterstrom | 2030-2033 | .281 | 44 | 188 | 0 | 0 | 0 | 0.00 | 0 |
| David Owens | 2030-2033 | .000 | 0 | 0 | 19 | 16 | 0 | 5.96 | 346 |
| Yodo Oyama | 2030-2033 | .000 | 0 | 0 | 6 | 11 | 36 | 5.77 | 114 |
