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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 |
|---|---|---|---|---|---|---|---|---|---|
| Joel O'Brien | 2061-2061 | .000 | 0 | 0 | 1 | 0 | 0 | 4.57 | 52 |
| Justin O'Brien | 2050-2050 | .000 | 0 | 0 | 6 | 5 | 0 | 3.86 | 80 |
| Stephen O'Brien | 2025-2025 | .000 | 0 | 0 | 8 | 5 | 0 | 2.71 | 107 |
| Stephen O'Brien | 2040-2041 | .289 | 23 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Bruce O'Connell | 2029-2029 | .000 | 0 | 0 | 5 | 10 | 0 | 5.55 | 69 |
| Bill O'Connor | 2076-2079 | .248 | 14 | 88 | 0 | 1 | 0 | 8.10 | 3 |
| Jarrod O'Connor | 2093-2097 | .282 | 3 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Jimmy O'Connor | 2033-2036 | .000 | 0 | 0 | 19 | 5 | 2 | 2.99 | 170 |
| Roger O'Donnell | 2058-2058 | .307 | 10 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan O'Hearn | 2015-2015 | .236 | 8 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Doug O'Malley | 2069-2070 | .000 | 0 | 0 | 8 | 4 | 0 | 3.39 | 125 |
| Dan O'Neil | 2075-2075 | .107 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Wade O'Neil | 2045-2048 | .000 | 0 | 0 | 10 | 6 | 21 | 2.83 | 220 |
| Braden Oaks | 2081-2081 | .312 | 5 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Scott Oaks | 2087-2087 | .337 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Brett Oberholtzer | 2010-2010 | .000 | 0 | 0 | 6 | 6 | 2 | 4.15 | 107 |
| Josh Oblinger | 2091-2092 | .000 | 0 | 0 | 6 | 10 | 0 | 3.62 | 152 |
| Edwin Ocampo | 2056-2056 | .000 | 0 | 0 | 0 | 0 | 1 | 4.82 | 12 |
| Jerry Ochoa | 2029-2029 | .000 | 0 | 0 | 2 | 4 | 0 | 6.25 | 27 |
| Jose Ochoa | 2058-2058 | .318 | 23 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Ochoa | 2087-2087 | .273 | 1 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Ramon Ochoa | 2097-2097 | .000 | 0 | 0 | 0 | 0 | 0 | 32.40 | 1 |
| Josh Ockimey | 2016-2016 | .246 | 2 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Mitch Odom | 2061-2061 | .372 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Rougned Odor | 2013-2013 | .305 | 5 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Odorizzi | 2011-2011 | .000 | 0 | 0 | 5 | 4 | 0 | 2.87 | 103 |
| Mason Oelke | 2058-2058 | .000 | 0 | 0 | 2 | 0 | 1 | 5.45 | 38 |
| Nefi Ogando | 2013-2013 | .000 | 0 | 0 | 2 | 3 | 3 | 4.09 | 44 |
| Bobby Ogaz | 2096-2096 | .000 | 0 | 0 | 0 | 2 | 0 | 6.48 | 12 |
| Pat Ogden | 2042-2043 | .000 | 0 | 0 | 12 | 11 | 0 | 3.23 | 143 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Ryan Ogle | 2098-2098 | .244 | 15 | 59 | 7 | 14 | 0 | 4.94 | 133 |
| Ross Ohlendorf | 2013-2014 | .000 | 0 | 0 | 0 | 1 | 0 | 9.64 | 6 |
| Michael Ohlman | 2013-2013 | .313 | 13 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Olague | 2038-2038 | .270 | 8 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Olguin | 2064-2066 | .000 | 0 | 0 | 21 | 5 | 2 | 2.76 | 250 |
| Armando Olivares | 2072-2072 | .265 | 13 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Olivarez | 2098-2098 | .308 | 3 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Santos Olivas | 2028-2029 | .296 | 33 | 101 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Oliver | 2016-2016 | .000 | 0 | 0 | 3 | 2 | 3 | 3.29 | 120 |
| Edwin Olivo | 2021-2021 | .258 | 11 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Olmedo | 2051-2052 | .000 | 0 | 0 | 2 | 1 | 0 | 8.02 | 8 |
| Scott Olsen | 2009-2010 | .000 | 0 | 0 | 0 | 0 | 0 | 3.38 | 8 |
| Garrett Olson | 2005-2006 | .000 | 0 | 0 | 4 | 4 | 0 | 2.82 | 96 |
| Mike Olt | 2011-2011 | .267 | 14 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby Olvera | 2097-2098 | .000 | 0 | 0 | 5 | 5 | 9 | 3.55 | 78 |
| Brian Omogrosso | 2007-2007 | .000 | 0 | 0 | 8 | 8 | 5 | 3.74 | 108 |
| Hirotoshi Onaka | 2013-2013 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ricardo Ontiveros | 2097-2098 | .000 | 0 | 0 | 0 | 2 | 1 | 3.94 | 18 |
| Lançarote Oom | 2073-2073 | .000 | 0 | 0 | 10 | 11 | 0 | 2.88 | 120 |
| Freddy Oquendo | 2081-2081 | .309 | 10 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Magglio Ordonez | 1995-1995 | .238 | 12 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Elias Orellana | 2097-2098 | .000 | 0 | 0 | 7 | 7 | 12 | 3.75 | 98 |
| Mike Orellana | 2098-2098 | .336 | 8 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Paulo Orlando | 2007-2009 | .258 | 22 | 119 | 0 | 0 | 0 | 0.00 | 0 |
| Arturo Orona | 2078-2081 | .000 | 0 | 0 | 8 | 5 | 1 | 4.23 | 78 |
| Evertz Orozco | 2017-2017 | .000 | 0 | 0 | 0 | 1 | 24 | 2.23 | 27 |
| Jose Orozco | 2090-2090 | .231 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Orozco | 2045-2046 | .251 | 11 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Orozco | 2049-2049 | .316 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Rogelio Orozco | 2072-2073 | .299 | 26 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Rogelio Orozco | 2058-2059 | .301 | 4 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Ruben Orozco | 2054-2055 | .296 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Pete Orr | 2001-2002 | .255 | 4 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Ortaga | 2047-2047 | .298 | 4 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Alexis Ortega | 2082-2082 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 3 |
| David Ortega | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 4.32 | 2 |
| Manny Ortega | 2072-2072 | .336 | 7 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Eric Ortez | 2045-2046 | .000 | 0 | 0 | 11 | 6 | 0 | 4.50 | 118 |
| Ryan Ortgies | 2046-2046 | .000 | 0 | 0 | 4 | 3 | 0 | 2.87 | 43 |
| David Ortiz | 2048-2052 | .000 | 0 | 0 | 39 | 30 | 1 | 4.22 | 507 |
| Fidel Ortiz | 2025-2025 | .000 | 0 | 0 | 5 | 3 | 30 | 3.30 | 65 |
| Javier Ortiz | 2005-2005 | .000 | 0 | 0 | 0 | 1 | 0 | 4.50 | 3 |
| Jesus Ortiz | 2067-2068 | .216 | 16 | 101 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Ortiz | 2011-2011 | .000 | 0 | 0 | 5 | 5 | 5 | 2.15 | 55 |
| Jordan Ortiz | 2094-2095 | .000 | 0 | 0 | 6 | 3 | 0 | 3.79 | 66 |
| Juan Ortiz | 2071-2071 | .320 | 3 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortiz | 2059-2059 | .272 | 10 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Leo Ortiz | 2091-2091 | .000 | 0 | 0 | 5 | 4 | 0 | 3.05 | 53 |
| Ramon Ortiz | 2005-2005 | .000 | 0 | 0 | 0 | 1 | 0 | 9.00 | 3 |
| Ricardo Ortiz | 2089-2089 | .242 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Ortiz | 2023-2023 | .429 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Ruben Ortiz | 2096-2096 | .251 | 11 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| William Ortiz | 2062-2062 | .271 | 9 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Sikes Orvis | 2016-2018 | .243 | 29 | 129 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Osborne | 2072-2072 | .346 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Osborne | 2033-2036 | .000 | 0 | 0 | 15 | 10 | 0 | 3.54 | 171 |
| Carlos Osorio | 2093-2096 | .000 | 0 | 0 | 4 | 6 | 4 | 4.30 | 67 |
| Jose Osorio | 2026-2026 | .246 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Rodolfo Ostiguin | 2080-2081 | .265 | 15 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Jimmy Ostrander | 2027-2027 | .165 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jonathan Oswalt | 2037-2037 | .314 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Otero | 2056-2056 | .000 | 0 | 0 | 7 | 3 | 4 | 4.79 | 84 |
| Ryan Otten | 2035-2036 | .000 | 0 | 0 | 5 | 5 | 0 | 2.87 | 47 |
| Josh Ouderkirk | 2075-2078 | .215 | 54 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Outman | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 4 |
| Benito Ovalle | 2094-2094 | .400 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Antonio Ovalles | 2094-2096 | .000 | 0 | 0 | 18 | 12 | 8 | 3.00 | 368 |
| Erik Overholtzer | 2097-2098 | .219 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Overton | 2041-2042 | .206 | 8 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Logan Owenby | 2096-2098 | .000 | 0 | 0 | 1 | 1 | 1 | 0.71 | 7 |
| Bobby Owens | 2058-2058 | .207 | 14 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Henry Owens | 2013-2013 | .000 | 0 | 0 | 8 | 5 | 0 | 2.92 | 123 |
| Rudy Owens | 2009-2009 | .000 | 0 | 0 | 1 | 1 | 0 | 3.86 | 22 |
| Ron Owings | 2096-2097 | .272 | 12 | 73 | 0 | 0 | 0 | 0.00 | 0 |
