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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 | 2031-2031 | .000 | 0 | 0 | 6 | 1 | 2 | 1.98 | 22 |
| Jordan O'Neill | 2030-2030 | .115 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Tom O'Reilly | 2032-2032 | .207 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Murtagh O'Sullivan | 2032-2032 | .000 | 0 | 0 | 0 | 2 | 6 | 7.84 | 9 |
| Helmuth Obermoser | 2032-2032 | .297 | 11 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Jarek Oberski | 2023-2024 | .000 | 0 | 0 | 15 | 7 | 0 | 2.23 | 151 |
| Jönn Odhe | 2028-2028 | .241 | 12 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Ignat Odoevsky | 2028-2030 | .223 | 19 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Oktav Oeggl | 2030-2031 | .000 | 0 | 0 | 8 | 10 | 1 | 4.26 | 151 |
| Patrick Oeggl | 2032-2032 | .164 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Pavlik Ofitserov | 2024-2024 | .000 | 0 | 0 | 1 | 2 | 0 | 4.79 | 13 |
| Moriz Oginsky | 2032-2032 | .000 | 0 | 0 | 1 | 0 | 0 | 1.59 | 5 |
| Naci Ogun | 2030-2030 | .306 | 7 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Khadzhi Oguz | 2032-2032 | .189 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Pavlusha Oistrah | 2026-2027 | .000 | 0 | 0 | 8 | 5 | 0 | 3.67 | 70 |
| Muneyoshi Okada | 2032-2032 | .000 | 0 | 0 | 8 | 5 | 0 | 4.31 | 96 |
| Mark Okeanov | 2027-2028 | .000 | 0 | 0 | 11 | 3 | 0 | 2.52 | 73 |
| Jesper Olafsson | 2030-2030 | .000 | 0 | 0 | 8 | 11 | 0 | 3.96 | 144 |
| Feliks Olferiev | 2032-2032 | .143 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Olijve | 2029-2032 | .000 | 0 | 0 | 11 | 8 | 6 | 3.99 | 116 |
| Dennis Oliver | 2032-2032 | .237 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Dominique Olivier | 2028-2029 | .198 | 6 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Julien Olivier | 2024-2025 | .258 | 10 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Olivo | 2030-2030 | .000 | 0 | 0 | 15 | 7 | 0 | 2.90 | 153 |
| Christophe Ollivier | 2031-2032 | .000 | 0 | 0 | 8 | 5 | 0 | 2.13 | 79 |
| Miguel Olmos | 2032-2032 | .000 | 0 | 0 | 0 | 1 | 2 | 4.50 | 6 |
| Ahmad Olsen | 2031-2031 | .241 | 30 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Lars Olthof | 2030-2031 | .215 | 15 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Les Olthuis | 2021-2025 | .000 | 0 | 0 | 9 | 5 | 12 | 1.33 | 123 |
| Jeirgif Omelkov | 2029-2032 | .228 | 0 | 8 | 0 | 0 | 0 | 0.00 | 2 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Bakhtiyar Omid | 2030-2030 | .225 | 9 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Giel Onderwater | 2030-2031 | .000 | 0 | 0 | 11 | 7 | 1 | 2.77 | 180 |
| Mitsunobu Ono | 2025-2028 | .500 | 1 | 1 | 3 | 22 | 33 | 6.17 | 94 |
| Henri Onofrei | 2021-2022 | .257 | 10 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Claas Oosterhoff | 2032-2032 | .000 | 0 | 0 | 4 | 0 | 0 | 4.45 | 34 |
| Dennis Oosthoek | 2032-2032 | .223 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Murat Opacic | 2024-2024 | .000 | 0 | 0 | 6 | 6 | 12 | 1.73 | 42 |
| Vilmos Orban | 2031-2032 | .184 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ufuk Orga | 2030-2030 | .250 | 4 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Denis Oristano | 2027-2029 | .000 | 0 | 0 | 11 | 11 | 0 | 3.54 | 74 |
| Fidel Orosco | 2031-2032 | .000 | 0 | 0 | 5 | 4 | 2 | 4.18 | 103 |
| Alexander Orr | 2025-2026 | .322 | 11 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| Akke Orsel | 2028-2030 | .000 | 0 | 0 | 10 | 29 | 0 | 5.53 | 299 |
| Martin Ortelli | 2026-2027 | .000 | 0 | 0 | 13 | 14 | 0 | 4.04 | 122 |
| Jordan Ortiz | 2026-2026 | .261 | 10 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Sertan Osmanoglu | 2024-2025 | .000 | 0 | 0 | 14 | 5 | 0 | 2.88 | 141 |
| David Osorio | 2022-2025 | .235 | 74 | 211 | 0 | 0 | 0 | 0.00 | 0 |
| Feliks Ostafiev | 2030-2031 | .000 | 0 | 0 | 5 | 8 | 0 | 4.34 | 91 |
| Valerik Ostafiev | 2021-2022 | .260 | 39 | 136 | 0 | 0 | 0 | 0.00 | 0 |
| Boris Ostahov | 2031-2032 | .000 | 0 | 0 | 7 | 2 | 3 | 4.84 | 162 |
| Rodolfo Osuna | 2031-2031 | .344 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Orel Otlesnov | 2032-2032 | .000 | 0 | 0 | 1 | 1 | 0 | 7.89 | 17 |
| Jamy Otten | 2029-2031 | .000 | 0 | 0 | 3 | 3 | 8 | 1.42 | 104 |
| Jaak Oud | 2028-2028 | .282 | 9 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Kobbe Oudin | 2032-2032 | .000 | 0 | 0 | 2 | 3 | 10 | 3.54 | 26 |
| Richie Oussoren | 2028-2030 | .000 | 0 | 0 | 13 | 8 | 56 | 2.02 | 174 |
| Paul Ouwens | 2022-2027 | .000 | 0 | 0 | 23 | 25 | 0 | 3.56 | 219 |
| Hamo Ovchiyan | 2028-2032 | .000 | 0 | 0 | 10 | 27 | 2 | 5.18 | 309 |
| Omer Overbeek | 2026-2027 | .242 | 43 | 144 | 0 | 0 | 0 | 0.00 | 0 |
| Jemke Overeem | 2031-2031 | .319 | 14 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Arjan Oxinos | 2024-2025 | .226 | 8 | 42 | 0 | 0 | 0 | 0.00 | 0 |
