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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 |
|---|---|---|---|---|---|---|---|---|---|
| Gordie O'Barr | 2030-2031 | .236 | 14 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Blake O'Brien | 2045-2048 | .000 | 0 | 0 | 4 | 4 | 0 | 6.13 | 106 |
| Clay O'Grady | 2039-2042 | .214 | 18 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Jamie O'Hearn | 2012-2014 | .285 | 38 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| Tristan O'Neal | 2048-2051 | .000 | 0 | 0 | 11 | 12 | 0 | 3.58 | 240 |
| Hugh O'Quinn | 1988-1989 | .234 | 18 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Glen O'Reilly | 1990-1993 | .000 | 0 | 0 | 8 | 5 | 41 | 2.75 | 164 |
| Ian Oberle | 2016-2017 | .000 | 0 | 0 | 10 | 4 | 0 | 4.12 | 99 |
| T.J. Oberstar | 2015-2016 | .000 | 0 | 0 | 2 | 3 | 0 | 8.82 | 53 |
| Logan Ocadiz | 2054-2057 | .254 | 17 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Manning Ogura | 2056-2058 | .324 | 11 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Tamasaburo Okamoto | 1988-1988 | .000 | 0 | 0 | 4 | 1 | 0 | 1.86 | 72 |
| Tatsuya Okinaka | 2026-2027 | .000 | 0 | 0 | 4 | 5 | 0 | 3.85 | 119 |
| Jelani Okumura | 2043-2045 | .259 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Jalen Olenick | 2057-2060 | .330 | 23 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Olivares | 1999-2002 | .000 | 0 | 0 | 23 | 11 | 0 | 3.03 | 334 |
| Willie Olivas | 2017-2018 | .000 | 0 | 0 | 6 | 2 | 0 | 2.69 | 133 |
| John Oliver | 2039-2041 | .200 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Jimmy Olsen | 2015-2019 | .279 | 23 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| Joseph Olsen | 2055-2057 | .333 | 29 | 105 | 0 | 0 | 0 | 0.00 | 0 |
| Brendan Olson | 1997-2000 | .306 | 54 | 163 | 0 | 0 | 0 | 0.00 | 0 |
| Damian Olson | 2041-2041 | .169 | 5 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Micah Olson | 2015-2016 | .231 | 7 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Pat Olson | 1997-2000 | .000 | 0 | 0 | 25 | 12 | 0 | 3.34 | 333 |
| Trevon Olvera | 2036-2037 | .326 | 32 | 106 | 0 | 0 | 0 | 0.00 | 0 |
| Khaleen Omariba | 2060-2060 | .600 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dusty Omohundro | 1992-1995 | .266 | 43 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Antonio Ontiveros | 2004-2007 | .363 | 3 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Anthone Ornelas | 2044-2046 | .312 | 31 | 114 | 0 | 0 | 0 | 0.00 | 0 |
| Ogden Orozco | 2036-2037 | .000 | 0 | 0 | 3 | 3 | 0 | 13.83 | 49 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Nathan Orr | 2038-2039 | .249 | 14 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Zach Orr | 2036-2037 | .000 | 0 | 0 | 6 | 3 | 1 | 10.74 | 58 |
| Sanford Ortaga | 2036-2038 | .231 | 11 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| J.J. Ortega | 2050-2053 | .000 | 0 | 0 | 11 | 4 | 10 | 4.40 | 156 |
| Karsten Ortegon | 2041-2044 | .417 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Ernest Ortez | 2045-2045 | .200 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Owen Orth | 2053-2056 | .261 | 42 | 104 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Ortigoza | 2003-2005 | .000 | 0 | 0 | 8 | 10 | 0 | 3.66 | 142 |
| Antonio Ortiz | 1997-2000 | .235 | 16 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| DeJohn Ortiz | 2059-2060 | .000 | 0 | 0 | 3 | 4 | 0 | 4.50 | 107 |
| Jahmel Ortiz | 2051-2054 | .229 | 13 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Clarence OrtÃz | 1988-1988 | .000 | 0 | 0 | 5 | 0 | 0 | 1.57 | 137 |
| Dave Osborn | 2031-2032 | .000 | 0 | 0 | 3 | 6 | 0 | 4.29 | 106 |
| Cristian Osborne | 2054-2057 | .295 | 8 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Jarrett Osborne | 2047-2047 | .000 | 0 | 0 | 3 | 0 | 0 | 4.00 | 30 |
| Logan Osborne | 2051-2053 | .111 | 0 | 0 | 2 | 3 | 1 | 6.46 | 72 |
| Elliott Osby | 2057-2060 | .247 | 13 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| J.R. Oss | 2018-2019 | .214 | 6 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Joseph Osterman | 2037-2038 | .300 | 15 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Landen Ostrander | 2057-2060 | .284 | 18 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Victor Overacker | 2019-2020 | .280 | 14 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Micah Overturff | 2021-2022 | .292 | 11 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Harvey Owens | 2051-2053 | .000 | 0 | 0 | 3 | 4 | 8 | 4.12 | 98 |
| Stuart Owens | 2054-2057 | .250 | 6 | 12 | 0 | 0 | 0 | 0.00 | 0 |
