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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ronald O'Dowd | 2030-2030 | .000 | 0 | 0 | 2 | 1 | 2 | 3.65 | 31 |
| Brendan O'Dwyer | 2029-2030 | .500 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jordan O'Neill | 2031-2031 | .365 | 2 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Tom O'Reilly | 2031-2032 | .380 | 17 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Murtagh O'Sullivan | 2032-2032 | .000 | 0 | 0 | 0 | 1 | 0 | 4.05 | 4 |
| Helmuth Obermoser | 2031-2031 | .267 | 3 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Gavrilo Obrenovic | 2030-2032 | .000 | 0 | 0 | 4 | 7 | 1 | 6.75 | 99 |
| Jönn Odhe | 2027-2028 | .295 | 24 | 90 | 0 | 0 | 0 | 0.00 | 0 |
| Ignat Odoevsky | 2027-2029 | .347 | 12 | 109 | 0 | 10 | 0 | 11.04 | 24 |
| Oktav Oeggl | 2029-2029 | .000 | 0 | 0 | 11 | 4 | 0 | 5.40 | 134 |
| Patrick Oeggl | 2031-2032 | .204 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Moriz Oginsky | 2029-2032 | .000 | 0 | 0 | 19 | 5 | 1 | 4.49 | 138 |
| Naci Ogun | 2027-2029 | .316 | 20 | 161 | 0 | 0 | 0 | 0.00 | 0 |
| Ayaz Oguz | 2029-2031 | .000 | 0 | 0 | 11 | 29 | 0 | 7.19 | 225 |
| Eshgin Oguz | 2032-2032 | .250 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Stanislav Ohanjanian | 2030-2032 | .000 | 0 | 0 | 1 | 4 | 0 | 5.77 | 18 |
| Pavlusha Oistrah | 2027-2027 | .000 | 0 | 0 | 4 | 0 | 0 | 1.90 | 33 |
| Vsevolod Oizerman | 2032-2032 | .378 | 5 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Muneyoshi Okada | 2028-2031 | .215 | 1 | 7 | 19 | 38 | 0 | 8.76 | 411 |
| Shoichi Okamoto | 2030-2032 | .000 | 0 | 0 | 2 | 4 | 3 | 5.74 | 56 |
| Shinji Okamura | 2032-2032 | .242 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Mark Okeanov | 2027-2027 | .000 | 0 | 0 | 12 | 4 | 0 | 2.48 | 137 |
| Jesper Olafsson | 2029-2030 | .350 | 0 | 4 | 4 | 1 | 0 | 4.50 | 29 |
| Sergio Olguin | 2029-2030 | .000 | 0 | 0 | 8 | 2 | 0 | 2.50 | 127 |
| Shurochka Olhovikov | 2032-2032 | .000 | 0 | 0 | 5 | 2 | 0 | 8.94 | 45 |
| Matt Olijve | 2029-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 4.82 | 4 |
| Dennis Oliver | 2030-2031 | .318 | 4 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Dominique Olivier | 2029-2029 | .273 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Olivo | 2027-2027 | .000 | 0 | 0 | 10 | 5 | 1 | 5.30 | 126 |
| Christophe Ollivier | 2029-2030 | .000 | 0 | 0 | 7 | 7 | 2 | 5.27 | 106 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Miguel Olmos | 2029-2032 | .038 | 1 | 2 | 9 | 13 | 12 | 6.77 | 126 |
| Ahmed Olsen | 2029-2029 | .314 | 3 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Bakhtiyar Omid | 2030-2030 | .346 | 20 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Damen Onassis | 2031-2032 | .314 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Giel Onderwater | 2029-2030 | .000 | 0 | 0 | 13 | 8 | 0 | 5.15 | 165 |
| Mitsunobu Ono | 2027-2028 | .000 | 0 | 0 | 7 | 4 | 0 | 4.54 | 110 |
| Claas Oosterhoff | 2029-2031 | .000 | 0 | 0 | 9 | 3 | 1 | 5.10 | 96 |
| Dennis Oosthoek | 2030-2031 | .324 | 9 | 112 | 0 | 0 | 0 | 0.00 | 0 |
| Vilmos Orban | 2030-2031 | .308 | 6 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Tayyar Orbay | 2032-2032 | .000 | 0 | 0 | 2 | 0 | 1 | 16.46 | 45 |
| Zulfugar Orbeliani | 2032-2032 | .000 | 0 | 0 | 1 | 1 | 2 | 6.14 | 13 |
| Sergio Ordonez | 2030-2032 | .000 | 0 | 0 | 3 | 1 | 4 | 4.77 | 52 |
| Nino Ordzhonnikidze | 2027-2032 | .274 | 7 | 62 | 0 | 0 | 0 | 3.00 | 4 |
| Gürel Orga | 2031-2032 | .242 | 4 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Ufuk Orga | 2028-2030 | .358 | 14 | 123 | 2 | 0 | 3 | 3.77 | 37 |
| Cumhur Orhan | 2032-2032 | .000 | 0 | 0 | 0 | 0 | 0 | 7.20 | 5 |
| Fidel Orosco | 2029-2031 | .000 | 0 | 0 | 6 | 4 | 2 | 4.94 | 96 |
| Zefirino Orphanides | 2032-2032 | .000 | 0 | 0 | 1 | 0 | 0 | 5.06 | 5 |
| Ed Orr | 2031-2032 | .333 | 0 | 5 | 2 | 3 | 0 | 5.84 | 71 |
| Akke Orsel | 2028-2028 | .000 | 0 | 0 | 0 | 2 | 0 | 5.59 | 13 |
| Octavio Ortega | 2028-2028 | .361 | 25 | 90 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Ortiz | 2032-2032 | .314 | 2 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Ferhan Osman | 2032-2032 | .000 | 0 | 0 | 0 | 0 | 11 | 1.93 | 12 |
| Boris Ostahov | 2027-2030 | .000 | 0 | 0 | 5 | 7 | 1 | 8.32 | 152 |
| Rodolfo Osuna | 2031-2031 | .337 | 19 | 118 | 0 | 0 | 0 | 0.00 | 0 |
| Eiichi Otsuki | 2029-2032 | .303 | 20 | 54 | 0 | 0 | 0 | 15.00 | 2 |
| Jamy Otten | 2028-2028 | .000 | 0 | 0 | 0 | 1 | 13 | 1.98 | 18 |
| Kobbe Oudin | 2029-2032 | .000 | 0 | 0 | 17 | 17 | 2 | 6.83 | 244 |
| Richie Oussoren | 2027-2027 | .000 | 0 | 0 | 5 | 0 | 20 | 2.00 | 76 |
| Hamo Ovchiyan | 2027-2030 | .500 | 0 | 0 | 3 | 5 | 2 | 7.24 | 31 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Quido Overbeeke | 2029-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Lesta Ovshinov | 2032-2032 | .000 | 0 | 0 | 5 | 4 | 0 | 5.37 | 49 |
| Sekla Owuor | 2031-2031 | .000 | 0 | 0 | 0 | 4 | 0 | 40.28 | 16 |
| Cahit Oyan | 2032-2032 | .275 | 3 | 25 | 0 | 0 | 0 | 0.00 | 0 |
