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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 |
|---|---|---|---|---|---|---|---|---|---|
| Bill O'Brien | 2027-2028 | .277 | 14 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Brien | 2026-2028 | .000 | 0 | 0 | 6 | 6 | 13 | 3.88 | 145 |
| John O'Brien | 2027-2028 | .195 | 5 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Brien | 2024-2026 | .234 | 6 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Robert O'Brien | 2028-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Callaghan | 2017-2017 | .384 | 4 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Jeffrey O'Connor | 2028-2028 | .266 | 9 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Jessie O'Connor | 2028-2028 | .000 | 0 | 0 | 1 | 0 | 1 | 6.85 | 23 |
| Andre O'Day | 2028-2028 | .209 | 7 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Tom O'Day | 2012-2016 | .000 | 0 | 0 | 21 | 12 | 0 | 2.41 | 464 |
| Greg O'Dell | 2023-2025 | .000 | 0 | 0 | 7 | 8 | 0 | 2.87 | 162 |
| Stanley O'Dell | 2024-2026 | .000 | 0 | 0 | 6 | 10 | 1 | 6.68 | 122 |
| Danny O'Doherty | 2016-2016 | .285 | 4 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Steven O'Donellan | 2025-2026 | .270 | 13 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Michael O'Donnell | 2025-2027 | .233 | 11 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Reese O'Donnell | 2012-2012 | .321 | 2 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Edgar O'Farrell | 2025-2027 | .000 | 0 | 0 | 6 | 10 | 0 | 4.06 | 170 |
| Eric O'Farrell | 2012-2014 | .000 | 0 | 0 | 10 | 5 | 25 | 2.23 | 121 |
| Steve O'Farrell | 2017-2018 | .268 | 12 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Clinton O'Halloran | 2027-2028 | .230 | 13 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Ben O'Herlihy | 2023-2025 | .000 | 0 | 0 | 0 | 0 | 1 | 6.51 | 56 |
| Bryan O'Herlihy | 2022-2024 | .284 | 24 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Brad O'Heyne | 2027-2028 | .000 | 0 | 0 | 0 | 4 | 0 | 6.49 | 63 |
| Reese O'Higgins | 2012-2012 | .458 | 5 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Dirk O'Keefe | 2026-2028 | .000 | 0 | 0 | 7 | 9 | 13 | 5.62 | 97 |
| Norris O'Keefe | 2025-2027 | .000 | 0 | 0 | 4 | 5 | 20 | 4.61 | 60 |
| Tom O'Mulroy | 2026-2028 | .000 | 0 | 0 | 3 | 0 | 0 | 5.53 | 68 |
| Bob O'Neal | 2025-2027 | .209 | 20 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Neal | 2025-2027 | .000 | 0 | 0 | 7 | 3 | 3 | 5.40 | 67 |
| Paul O'Neal | 2023-2025 | .204 | 3 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Clayton O'Neil | 2012-2015 | .000 | 0 | 0 | 9 | 6 | 14 | 3.54 | 213 |
| Mark O'Neil | 2016-2019 | .323 | 29 | 122 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Neill | 2022-2024 | .000 | 0 | 0 | 6 | 14 | 0 | 5.20 | 170 |
| Kelly O'Neill | 2024-2026 | .000 | 0 | 0 | 3 | 7 | 1 | 5.34 | 69 |
| Wilton O'Neill | 2018-2019 | .000 | 0 | 0 | 6 | 5 | 0 | 3.99 | 110 |
| Matt O'Reilly | 2028-2028 | .240 | 8 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Norm O'Reilly | 2028-2028 | .235 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Everett O'Rorke | 2013-2016 | .295 | 36 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Spike O'Rourke | 2028-2028 | .000 | 0 | 0 | 7 | 0 | 1 | 6.03 | 44 |
| Steffen O'Slattery | 2026-2026 | .000 | 0 | 0 | 2 | 2 | 0 | 5.80 | 45 |
| Anastasio Ocampo | 2022-2025 | .301 | 42 | 131 | 0 | 0 | 0 | 0.00 | 0 |
| Bryant Oglethorpe | 2012-2013 | .000 | 0 | 0 | 4 | 5 | 1 | 6.46 | 92 |
| Tony Oglethorpe | 2013-2014 | .356 | 16 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Oliver | 2025-2027 | .253 | 20 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Oliver | 2026-2028 | .238 | 23 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Olsen | 2012-2016 | .320 | 19 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Olson | 2027-2028 | .000 | 0 | 0 | 3 | 3 | 1 | 4.67 | 48 |
| Joey Olson | 2028-2028 | .000 | 0 | 0 | 4 | 0 | 0 | 5.31 | 47 |
| Melvin Olsson | 2025-2027 | .000 | 0 | 0 | 12 | 7 | 1 | 6.67 | 109 |
| Luis Olvera | 2015-2018 | .000 | 0 | 0 | 13 | 15 | 0 | 3.86 | 221 |
| Yasujiro Ono | 2012-2015 | .000 | 0 | 0 | 11 | 9 | 0 | 3.35 | 376 |
| António Ontiveros | 2024-2025 | .250 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| José Ordóńez | 2027-2028 | .286 | 12 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Jeaic Orfeur | 2026-2028 | .249 | 9 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| César Orozco | 2019-2021 | .000 | 0 | 0 | 11 | 7 | 0 | 2.30 | 201 |
| Sergio Orozco | 2015-2016 | .378 | 15 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Orr | 2023-2025 | .240 | 5 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Andrés Ortega | 2012-2014 | .224 | 18 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2025-2027 | .317 | 39 | 145 | 0 | 0 | 0 | 0.00 | 0 |
| Manuel Ortega | 2016-2018 | .325 | 4 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Adrián Ortíz | 2013-2015 | .398 | 16 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Alejandro Ortíz | 2017-2018 | .293 | 7 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Félix Ortíz | 2012-2015 | .000 | 0 | 0 | 19 | 9 | 0 | 3.10 | 301 |
| Fernando Ortíz | 2026-2028 | .000 | 0 | 0 | 2 | 7 | 1 | 6.75 | 114 |
| Jesús Ortíz | 2012-2016 | .000 | 0 | 0 | 16 | 10 | 17 | 3.13 | 249 |
| Jorge Ortíz | 2021-2023 | .268 | 9 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Ortíz | 2025-2027 | .328 | 22 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Ortíz | 2017-2020 | .299 | 54 | 132 | 0 | 0 | 0 | 0.00 | 0 |
| Rodrigo Ortíz | 2028-2028 | .000 | 0 | 0 | 1 | 3 | 1 | 5.18 | 21 |
| Wilson Ortíz | 2021-2023 | .342 | 12 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Osborn | 2013-2015 | .310 | 4 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Melvin Osborne | 2025-2027 | .250 | 3 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Osborne | 2012-2013 | .000 | 0 | 0 | 8 | 7 | 0 | 2.46 | 204 |
| Rafael Ospira | 2016-2019 | .308 | 31 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| Sal Ostendorff | 2017-2018 | .331 | 27 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Otero | 2021-2021 | .204 | 5 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Gabriel Řvsthus | 2028-2028 | .273 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Kent Owen | 2028-2028 | .423 | 6 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Woody Owen | 2012-2013 | .000 | 0 | 0 | 4 | 8 | 0 | 5.04 | 166 |
| Conan Owens | 2025-2027 | .000 | 0 | 0 | 7 | 4 | 1 | 5.47 | 117 |
| Dominic Owens | 2017-2017 | .500 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Melvin Owens | 2024-2026 | .231 | 7 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Sofronio Oxinos | 2025-2026 | .322 | 16 | 60 | 0 | 0 | 0 | 0.00 | 0 |
