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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 |
|---|---|---|---|---|---|---|---|---|---|
| Chang-yong O | 2037-2040 | .224 | 8 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Ki-hyuk O | 2007-2007 | .000 | 0 | 0 | 2 | 1 | 0 | 6.30 | 20 |
| Nick O'Brennan | 2038-2040 | .000 | 0 | 0 | 7 | 5 | 2 | 3.61 | 39 |
| Chris O'Brien | 2038-2040 | .208 | 7 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Clarence O'Brien | 2039-2040 | .000 | 0 | 0 | 2 | 4 | 5 | 1.54 | 26 |
| Dan O'Brien | 2036-2039 | .000 | 0 | 0 | 3 | 9 | 20 | 2.31 | 50 |
| Ken O'Brien | 2038-2040 | .247 | 4 | 15 | 5 | 6 | 0 | 4.31 | 43 |
| Mark O'Brien | 2033-2035 | .000 | 0 | 0 | 3 | 1 | 3 | 6.55 | 22 |
| Craig O'Bryan | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 4.26 | 7 |
| Forrest O'Connor | 2007-2007 | .381 | 0 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Tony O'Connor | 2028-2031 | .000 | 0 | 0 | 4 | 7 | 38 | 1.80 | 116 |
| Jonathan O'Dell | 2038-2040 | .000 | 0 | 0 | 12 | 3 | 0 | 1.39 | 97 |
| Dan O'Halloran | 2034-2037 | .260 | 21 | 70 | 11 | 5 | 0 | 1.99 | 128 |
| Edward O'Halloran | 2029-2033 | .000 | 0 | 0 | 3 | 4 | 35 | 2.10 | 124 |
| Mike O'Halloran | 2031-2034 | .000 | 0 | 0 | 7 | 5 | 18 | 2.48 | 102 |
| Johnny O'Hanraghan | 2039-2040 | .000 | 0 | 0 | 2 | 5 | 0 | 3.57 | 32 |
| Harry O'Hyes | 2034-2037 | .000 | 0 | 0 | 3 | 6 | 2 | 3.65 | 76 |
| Ed O'Kernaghan | 2034-2037 | .203 | 17 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Dax O'Mannis | 2009-2009 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Derrick O'Melaghlin | 2040-2040 | .000 | 0 | 0 | 4 | 1 | 0 | 0.75 | 33 |
| Walter O'Mullan | 2036-2039 | .211 | 10 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Mitch O'Neal | 2036-2039 | .228 | 13 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Malcolm O'Neil | 2035-2038 | .206 | 28 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Rod O'Neil | 2036-2039 | .249 | 18 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Rich O'Neill | 2007-2009 | .276 | 13 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Quinn | 2035-2038 | .228 | 6 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Willie O'Quinn | 2034-2034 | .206 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Daryl O'Slattery | 2014-2017 | .000 | 0 | 0 | 9 | 5 | 24 | 6.15 | 113 |
| Terry O'Slattery | 2028-2031 | .146 | 12 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Timothy O'Slattery | 2031-2034 | .000 | 0 | 0 | 6 | 7 | 11 | 2.07 | 235 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| John O'Toole | 2023-2023 | .256 | 5 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| José Ocampo | 2037-2040 | .000 | 0 | 0 | 4 | 6 | 2 | 2.52 | 110 |
| Eddie Ochoa | 2038-2040 | .000 | 0 | 0 | 6 | 4 | 0 | 3.36 | 43 |
| Michael Lee Oday | 2035-2038 | .287 | 43 | 135 | 0 | 0 | 0 | 0.00 | 0 |
| Devin Odom | 2036-2039 | .000 | 0 | 0 | 3 | 5 | 32 | 1.82 | 75 |
| Carl Oglethorpe | 2036-2039 | .000 | 0 | 0 | 4 | 5 | 10 | 1.89 | 44 |
| Guillermo Oilvares | 2036-2039 | .263 | 16 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Olinger | 2014-2016 | .000 | 0 | 0 | 5 | 14 | 2 | 7.65 | 67 |
| Julián Olivares | 2009-2012 | .000 | 0 | 0 | 9 | 8 | 31 | 2.32 | 135 |
| Júlio Olivares | 2008-2010 | .351 | 25 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Olivas | 2008-2011 | .000 | 0 | 0 | 4 | 14 | 4 | 6.82 | 122 |
| Mike Oliveira | 2039-2040 | .298 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Oliver | 2039-2040 | .000 | 0 | 0 | 0 | 2 | 0 | 2.04 | 24 |
| Johnny Oliver | 2007-2010 | .321 | 11 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Oliver | 2020-2022 | .000 | 0 | 0 | 6 | 1 | 2 | 2.04 | 136 |
| Porter Oliver | 2037-2040 | .000 | 0 | 0 | 14 | 9 | 0 | 2.04 | 154 |
| Tim Oliver | 2030-2030 | .000 | 0 | 0 | 0 | 3 | 0 | 6.18 | 17 |
| Víctor Oliver | 2030-2030 | .000 | 0 | 0 | 5 | 1 | 0 | 2.17 | 63 |
| Ángel Oliveros | 2030-2033 | .228 | 43 | 105 | 0 | 0 | 0 | 0.00 | 0 |
| Tim Olsen | 2038-2039 | .000 | 0 | 0 | 1 | 2 | 2 | 2.86 | 24 |
| Brian Olson | 2039-2040 | .257 | 10 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Olson | 2009-2012 | .000 | 0 | 0 | 9 | 8 | 6 | 5.13 | 167 |
| Sam Olson | 2026-2029 | .257 | 33 | 104 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Olvera | 2036-2039 | .000 | 0 | 0 | 5 | 3 | 3 | 4.39 | 67 |
| Javier Olvera | 2035-2038 | .219 | 19 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| David Ordóñez | 2040-2040 | .000 | 0 | 0 | 0 | 1 | 0 | 0.00 | 0 |
| Gabriel Ordóñez | 2037-2040 | .000 | 0 | 0 | 5 | 7 | 2 | 3.94 | 87 |
| José Ordóñez | 2030-2033 | .237 | 29 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Vic Ordóñez | 2025-2028 | .199 | 26 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Origel | 2039-2040 | .000 | 0 | 0 | 1 | 3 | 1 | 4.15 | 24 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jorge Ornelas | 2007-2009 | .288 | 19 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Carlos Orozco | 2032-2035 | .209 | 12 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Orozco | 2039-2040 | .000 | 0 | 0 | 2 | 1 | 0 | 3.46 | 12 |
| Lewis Orr | 2039-2039 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2014-2017 | .410 | 60 | 211 | 0 | 0 | 0 | 0.00 | 0 |
| Dirk Ortega | 2025-2028 | .238 | 14 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Ortega | 2040-2040 | .000 | 0 | 0 | 3 | 1 | 0 | 3.12 | 15 |
| Félix Ortega | 2007-2007 | .000 | 0 | 0 | 4 | 1 | 0 | 3.62 | 51 |
| Luis Ortega | 2037-2040 | .187 | 10 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Ortega | 2018-2021 | .386 | 89 | 346 | 0 | 0 | 0 | 0.00 | 0 |
| Rubén Ortega | 2025-2028 | .249 | 17 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Cisco Ortíz | 2035-2038 | .220 | 14 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Cristián Ortíz | 2036-2039 | .000 | 0 | 0 | 10 | 10 | 8 | 2.46 | 87 |
| Dan Ortíz | 2030-2033 | .000 | 0 | 0 | 3 | 4 | 3 | 3.18 | 92 |
| David Ortíz | 2035-2038 | .216 | 9 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Gustavo Ortíz | 2034-2037 | .199 | 4 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry Ortíz | 2038-2040 | .000 | 0 | 0 | 7 | 13 | 0 | 4.86 | 53 |
| Jesús Ortíz | 2040-2040 | .000 | 0 | 0 | 1 | 0 | 0 | 0.93 | 5 |
| Jorge Ortíz | 2035-2038 | .223 | 18 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2039-2040 | .238 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2007-2009 | .000 | 0 | 0 | 5 | 12 | 1 | 8.54 | 73 |
| Manuel Ortíz | 2040-2040 | .261 | 2 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Ortíz | 2013-2016 | .334 | 37 | 122 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Ortíz | 2038-2040 | .267 | 7 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Ortíz | 2034-2037 | .214 | 8 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Kerry Osborne | 2040-2040 | .000 | 0 | 0 | 0 | 0 | 0 | 17.36 | 3 |
| John Osequedo | 2036-2039 | .000 | 0 | 0 | 7 | 8 | 5 | 4.69 | 94 |
| Tyrone Osorio | 2038-2040 | .000 | 0 | 0 | 3 | 8 | 0 | 3.94 | 40 |
| James Ostrander | 2026-2026 | .000 | 0 | 0 | 2 | 1 | 0 | 3.13 | 23 |
| Barry Owen | 2039-2040 | .000 | 0 | 0 | 1 | 1 | 2 | 3.13 | 23 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Walt Owens | 2040-2040 | .308 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
