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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 |
|---|---|---|---|---|---|---|---|---|---|
| Brennan O'Bannon | 2022-2023 | .000 | 0 | 0 | 8 | 8 | 1 | 3.43 | 149 |
| Eric O'Berry | 2018-2018 | .189 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Jake O'Brien | 2017-2019 | .000 | 0 | 0 | 14 | 14 | 3 | 3.38 | 296 |
| Matt O'Brien | 2025-2025 | .304 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Dale O'Connell | 2023-2023 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 4 |
| John O'Connell | 2026-2026 | .000 | 0 | 0 | 11 | 9 | 0 | 2.68 | 112 |
| Matt O'Connor | 2017-2019 | .000 | 0 | 0 | 24 | 23 | 6 | 4.05 | 269 |
| Josh O'Donnell | 2022-2023 | .000 | 0 | 0 | 7 | 4 | 3 | 2.48 | 112 |
| Ryan O'Hearn | 2020-2026 | .253 | 21 | 131 | 0 | 0 | 0 | 0.00 | 0 |
| Greg O'Keefe | 2025-2026 | .000 | 0 | 0 | 11 | 6 | 0 | 2.51 | 99 |
| Jason O'Keeffe | 2016-2021 | .232 | 13 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy O'Leary | 2016-2017 | .252 | 14 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Taylor O'Meara | 2024-2026 | .000 | 0 | 0 | 27 | 14 | 1 | 3.70 | 277 |
| Chase O'Neal | 2023-2023 | .213 | 7 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Neal | 2026-2026 | .000 | 0 | 0 | 9 | 8 | 0 | 3.38 | 101 |
| Chris O'Neal | 2021-2022 | .207 | 7 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Jody O'Neil | 2019-2024 | .242 | 21 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Neill | 2018-2024 | .274 | 8 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Ross O'Rourke | 2020-2021 | .000 | 0 | 0 | 2 | 5 | 0 | 3.34 | 92 |
| Chris O'Sullivan | 2018-2021 | .226 | 7 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Tim Ocampo | 2021-2026 | .236 | 19 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Oceguera | 2023-2026 | .000 | 0 | 0 | 20 | 22 | 4 | 4.48 | 290 |
| Billy Ochoa | 2022-2022 | .000 | 0 | 0 | 2 | 3 | 1 | 3.45 | 31 |
| Tae-geun Ock | 2021-2021 | .216 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Odenweller | 2026-2026 | .213 | 5 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Odette | 2018-2020 | .184 | 6 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Jamie Offield | 2016-2017 | .000 | 0 | 0 | 17 | 19 | 0 | 3.29 | 223 |
| Tsunesuke Ogawa | 2024-2026 | .220 | 3 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| David Ogden | 2025-2026 | .000 | 0 | 0 | 4 | 8 | 2 | 6.06 | 63 |
| Jung-choon Oh | 2026-2026 | .000 | 0 | 0 | 4 | 4 | 0 | 4.18 | 45 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Joel Ojeda | 2020-2026 | .191 | 7 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Makoto Okamura | 2026-2026 | .237 | 3 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Wei-Tzu Oki | 2023-2023 | .000 | 0 | 0 | 1 | 0 | 1 | 3.91 | 10 |
| Miguel Olea | 2023-2023 | .000 | 0 | 0 | 12 | 8 | 0 | 3.03 | 161 |
| Tony Olivares | 2025-2025 | .000 | 0 | 0 | 4 | 6 | 0 | 5.27 | 63 |
| Roberto Olivas | 2021-2026 | .225 | 23 | 140 | 0 | 0 | 0 | 0.00 | 2 |
| Willie Olivas | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 5.59 | 17 |
| Joel Oliver | 2020-2021 | .000 | 0 | 0 | 14 | 13 | 0 | 2.49 | 239 |
| Noah Oliver | 2023-2023 | .000 | 0 | 0 | 3 | 4 | 0 | 4.17 | 68 |
| Alix Ollivier | 2020-2023 | .219 | 14 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Clayton Ollivier | 2023-2026 | .000 | 0 | 0 | 14 | 17 | 15 | 3.89 | 258 |
| Justin Olson | 2022-2023 | .232 | 8 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olson | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 1.80 | 17 |
| John Olund | 2020-2023 | .282 | 4 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Kazuhiro Ono | 2024-2026 | .000 | 0 | 0 | 8 | 10 | 10 | 4.09 | 208 |
| Khaled Onyebuchi | 2021-2026 | .000 | 0 | 0 | 7 | 5 | 3 | 4.12 | 150 |
| David Openshaw | 2024-2024 | .259 | 3 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Vinny Oquendo | 2026-2026 | .263 | 4 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ordonez | 2022-2024 | .169 | 3 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Orduna | 2017-2025 | .234 | 9 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Blaine Orea | 2024-2026 | .215 | 7 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy Orejuela | 2023-2026 | .000 | 0 | 0 | 17 | 16 | 2 | 3.77 | 225 |
| Shane Orman | 2020-2020 | .286 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Vince Orman | 2019-2026 | .190 | 4 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Oropeza | 2023-2023 | .000 | 0 | 0 | 0 | 1 | 0 | 9.53 | 3 |
| Luis Orta | 2024-2026 | .000 | 0 | 0 | 9 | 0 | 1 | 2.82 | 99 |
| Alex Ortega | 2025-2026 | .217 | 13 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Antonio Ortega | 2022-2023 | .000 | 0 | 0 | 3 | 7 | 0 | 3.45 | 79 |
| Damian Ortega | 2023-2025 | .000 | 0 | 0 | 9 | 9 | 24 | 3.09 | 143 |
| Erik Ortega | 2020-2025 | .000 | 0 | 0 | 13 | 14 | 3 | 3.66 | 235 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Alex Ortiz | 2024-2024 | .375 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby Ortiz | 2021-2026 | .201 | 23 | 98 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortiz | 2024-2026 | .233 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Melvin Ortiz | 2016-2026 | .244 | 38 | 156 | 0 | 0 | 0 | 0.00 | 0 |
| Vince Ortiz | 2020-2025 | .000 | 0 | 0 | 19 | 30 | 5 | 3.91 | 404 |
| Flynn Orton | 2024-2026 | .253 | 18 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Barney Osborne | 2026-2026 | .000 | 0 | 0 | 1 | 2 | 0 | 7.84 | 4 |
| Jim Ostby | 2022-2026 | .199 | 26 | 130 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Osterhout | 2023-2025 | .274 | 6 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Chomei Osumi | 2020-2021 | .258 | 3 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Kunio Ota | 2026-2026 | .259 | 0 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Sachiko Ota | 2024-2026 | .219 | 1 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Tsuneyoshi Ota | 2024-2026 | .000 | 0 | 0 | 12 | 25 | 0 | 3.86 | 211 |
| Emanuel Otero | 2024-2026 | .000 | 0 | 0 | 17 | 12 | 3 | 4.47 | 256 |
| Paul Otero | 2022-2024 | .252 | 32 | 155 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Ottman | 2026-2026 | .283 | 17 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ousley | 2020-2020 | .200 | 5 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Dusty Overbey | 2021-2021 | .302 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Owens | 2024-2026 | .000 | 0 | 0 | 13 | 8 | 4 | 4.02 | 172 |
| Joe Owens | 2019-2019 | .000 | 0 | 0 | 2 | 2 | 2 | 4.29 | 13 |
