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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 |
|---|---|---|---|---|---|---|---|---|---|
| Casey O'Brien | 2046-2047 | .000 | 0 | 0 | 6 | 15 | 0 | 4.28 | 112 |
| Chris O'Brien | 2015-2016 | .292 | 11 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Peter O'Brien | 2014-2014 | .245 | 23 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Joel O'Connell | 2045-2045 | .000 | 0 | 0 | 4 | 2 | 0 | 6.59 | 43 |
| Jared O'Conner | 2032-2032 | .000 | 0 | 0 | 7 | 2 | 0 | 2.90 | 92 |
| Bob O'Connor | 2039-2041 | .000 | 0 | 0 | 14 | 8 | 62 | 1.62 | 155 |
| Josh O'Connor | 2047-2048 | .190 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Peter O'Connor | 2043-2045 | .181 | 12 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Hara | 2046-2046 | .154 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kenny O'Hara | 2045-2046 | .217 | 5 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Nick O'Neal | 2048-2049 | .313 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler O'Neill | 2024-2024 | .251 | 21 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy O'Regan | 2033-2033 | .000 | 0 | 0 | 3 | 2 | 0 | 2.74 | 54 |
| Ryan O'Rourke | 2013-2014 | .000 | 0 | 0 | 2 | 6 | 6 | 4.19 | 71 |
| T.J. O'Rourke | 2047-2047 | .231 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Oathout | 2030-2032 | .000 | 0 | 0 | 15 | 11 | 0 | 3.30 | 223 |
| Matt Oberste | 2016-2017 | .263 | 10 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ocampo | 2044-2045 | .283 | 21 | 120 | 0 | 0 | 0 | 0.00 | 0 |
| Jeffri Ocando | 2022-2024 | .000 | 0 | 0 | 9 | 1 | 2 | 1.26 | 104 |
| Bernie Ochoa | 2042-2042 | .000 | 0 | 0 | 0 | 0 | 4 | 0.00 | 4 |
| Jose Ochoa | 2041-2044 | .296 | 4 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Tim Ochoa | 2023-2023 | .353 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Victor Ochoa | 2041-2041 | .252 | 0 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Wes Ochs | 2039-2042 | .267 | 12 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Oden | 2030-2030 | .264 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Nefi Ogando | 2014-2015 | .000 | 0 | 0 | 7 | 4 | 9 | 4.96 | 90 |
| Mitsuyoshi Ogawa | 2024-2024 | .000 | 0 | 0 | 6 | 1 | 0 | 2.52 | 77 |
| Phil Ogle | 2045-2045 | .229 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Young-chul Oh | 2022-2023 | .248 | 6 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Ross Ohlendorf | 2010-2011 | .000 | 0 | 0 | 0 | 0 | 0 | 2.08 | 9 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Michael Ohlman | 2014-2014 | .236 | 2 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Okert | 2014-2014 | .000 | 0 | 0 | 1 | 0 | 5 | 2.73 | 38 |
| Chris Okey | 2017-2018 | .249 | 8 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Cato Oldroyd | 2045-2046 | .195 | 3 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Greg Oleson | 2048-2049 | .242 | 14 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Jesus Olguin | 2046-2046 | .000 | 0 | 0 | 3 | 1 | 0 | 3.83 | 40 |
| Willie Oliva | 2033-2034 | .264 | 10 | 124 | 0 | 0 | 0 | 0.00 | 0 |
| Orlando Olivarez | 2049-2049 | .200 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Oliver | 2010-2016 | .000 | 0 | 0 | 7 | 6 | 3 | 3.20 | 128 |
| Jeremy Oliver | 2046-2049 | .229 | 23 | 128 | 0 | 0 | 0 | 0.00 | 0 |
| Lester Oliveros | 2010-2014 | .000 | 0 | 0 | 7 | 4 | 28 | 2.06 | 116 |
| Cristian Olivo | 2019-2020 | .251 | 18 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Ruben Olivo | 2047-2048 | .000 | 0 | 0 | 4 | 3 | 3 | 5.42 | 85 |
| Edgar Olmos | 2016-2016 | .000 | 0 | 0 | 7 | 7 | 1 | 3.67 | 89 |
| Bob Olson | 2045-2045 | .176 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ontiveros | 2046-2048 | .000 | 0 | 0 | 19 | 20 | 1 | 4.14 | 183 |
| Ivan Ontiveros | 2041-2044 | .000 | 0 | 0 | 13 | 24 | 78 | 2.83 | 227 |
| Jose Ontiveros | 2049-2049 | .275 | 6 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Shane Opitz | 2015-2016 | .260 | 12 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Orellana | 2048-2049 | .225 | 9 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Manny Oritz | 2048-2049 | .000 | 0 | 0 | 15 | 10 | 0 | 2.75 | 149 |
| Matt Ornelas | 2034-2037 | .000 | 0 | 0 | 15 | 20 | 1 | 3.51 | 279 |
| Billy Oropesa | 2023-2025 | .228 | 3 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Orozco | 2049-2049 | .213 | 2 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Orr | 2047-2048 | .283 | 9 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Pete Orr | 2004-2007 | .300 | 2 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Oliver Ortega | 2022-2024 | .000 | 0 | 0 | 3 | 7 | 19 | 2.75 | 94 |
| Alejandro Ortiz | 2046-2047 | .000 | 0 | 0 | 9 | 14 | 0 | 4.54 | 93 |
| Alex Ortiz | 2047-2049 | .258 | 27 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Ortiz | 2043-2043 | .299 | 2 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Dave Ortiz | 2049-2049 | .000 | 0 | 0 | 0 | 12 | 0 | 7.22 | 60 |
| David Ortiz | 2008-2008 | .250 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Emilio Ortiz | 2045-2049 | .212 | 10 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ortiz | 2044-2047 | .000 | 0 | 0 | 11 | 4 | 0 | 3.53 | 125 |
| Jared Ortiz | 2021-2022 | .282 | 5 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Jesus Ortiz | 2045-2046 | .272 | 3 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Ortiz | 2025-2028 | .235 | 47 | 173 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortiz | 2026-2028 | .000 | 0 | 0 | 9 | 12 | 1 | 3.53 | 184 |
| Tony Ortiz | 2047-2047 | .000 | 0 | 0 | 2 | 1 | 0 | 3.65 | 11 |
| Josh Osborn | 2047-2049 | .000 | 0 | 0 | 21 | 8 | 1 | 3.31 | 251 |
| Josh Osich | 2013-2015 | .000 | 0 | 0 | 3 | 4 | 22 | 3.34 | 89 |
| Christian Osorio | 2019-2019 | .000 | 0 | 0 | 8 | 8 | 0 | 3.22 | 110 |
| John Osorio | 2048-2049 | .000 | 0 | 0 | 0 | 3 | 0 | 4.89 | 23 |
| Willie Osorio | 2044-2048 | .259 | 7 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Ossenfort | 2046-2047 | .188 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Osterman | 2047-2047 | .500 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Hector Osuna | 2049-2049 | .000 | 0 | 0 | 10 | 6 | 0 | 4.52 | 176 |
| Jose Osuna | 2015-2018 | .274 | 30 | 178 | 0 | 0 | 0 | 0.00 | 0 |
| Corey Oswalt | 2017-2022 | .000 | 0 | 0 | 12 | 21 | 0 | 5.35 | 205 |
| Bobby Otano | 2048-2049 | .225 | 8 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Otero | 2009-2011 | .000 | 0 | 0 | 2 | 4 | 20 | 1.29 | 71 |
| Ricardo Otero | 2033-2033 | .199 | 6 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ott | 2048-2049 | .205 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron Ouelette | 2046-2047 | .000 | 0 | 0 | 4 | 11 | 35 | 3.32 | 90 |
| Joey Ouimet | 2038-2040 | .284 | 28 | 134 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Outman | 2007-2008 | .316 | 1 | 5 | 7 | 7 | 1 | 3.69 | 100 |
| Chong-xian Ouyang | 2027-2027 | .293 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy Ovalle | 2021-2024 | .000 | 0 | 0 | 18 | 23 | 61 | 4.42 | 208 |
| Tony Ovalles | 2048-2048 | .291 | 13 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Overholt | 2041-2045 | .000 | 0 | 0 | 19 | 16 | 0 | 3.78 | 330 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Brad Owens | 2047-2047 | .312 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Henry Owens | 2013-2014 | .000 | 0 | 0 | 17 | 5 | 0 | 2.44 | 172 |
| Justin Owens | 2048-2049 | .000 | 0 | 0 | 5 | 6 | 37 | 2.07 | 108 |
| Chris Owings | 2024-2024 | .250 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Tooru Oyama | 2043-2043 | .000 | 0 | 0 | 4 | 2 | 28 | 2.21 | 65 |
| Nick Oyler | 2036-2036 | .307 | 5 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ozolins | 2031-2034 | .000 | 0 | 0 | 9 | 18 | 0 | 4.44 | 202 |
