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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 |
|---|---|---|---|---|---|---|---|---|---|
| Danny O'Brien | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Jim O'Brien | 2028-2028 | .216 | 3 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Peter O'Brien | 2014-2019 | .324 | 19 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Brad O'Connell | 2022-2022 | .000 | 0 | 0 | 5 | 11 | 0 | 5.52 | 111 |
| Jadon O'Conner | 2038-2039 | .225 | 21 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Justin O'Conner | 2014-2018 | .219 | 20 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Nick O'Day | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 0.77 | 13 |
| Ben O'Hara | 2046-2047 | .163 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Leary | 2030-2036 | .255 | 4 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Shawn O'Malley | 2010-2013 | .249 | 4 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan O'Neal | 2046-2046 | .000 | 0 | 0 | 2 | 1 | 0 | 3.68 | 55 |
| Tyler O'Neill | 2016-2016 | .293 | 24 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan O'Rourke | 2015-2017 | .000 | 0 | 0 | 1 | 0 | 0 | 1.59 | 7 |
| R.J. Oakes | 2043-2043 | .301 | 6 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Oberg | 2044-2044 | .000 | 0 | 0 | 5 | 7 | 1 | 4.67 | 49 |
| Brett Oberholtzer | 2011-2011 | .107 | 0 | 1 | 9 | 9 | 0 | 3.74 | 93 |
| AntoÕio Oca | 2045-2046 | .213 | 19 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ocana | 2027-2028 | .272 | 17 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Ochoa | 2046-2047 | .191 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Rodolfo Ochoa | 2042-2046 | .000 | 0 | 0 | 6 | 6 | 17 | 2.67 | 81 |
| Josh Ockimey | 2018-2019 | .264 | 11 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ogaz | 2028-2029 | .224 | 3 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Ross Ohlendorf | 2006-2006 | .143 | 2 | 5 | 10 | 8 | 0 | 3.29 | 125 |
| Will Ohman | 2000-2000 | .333 | 0 | 0 | 6 | 4 | 3 | 1.89 | 85 |
| Rikuo Okada | 2025-2025 | .299 | 33 | 117 | 0 | 0 | 0 | 0.00 | 0 |
| Jadon Okpala | 2044-2046 | .000 | 0 | 0 | 12 | 10 | 22 | 3.02 | 154 |
| Esteban Oliva | 2045-2046 | .206 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Cristian Olivo | 2023-2025 | .305 | 54 | 190 | 0 | 0 | 0 | 0.00 | 0 |
| Ray Olmedo | 2002-2003 | .259 | 5 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| David Olmedo-Barrera | 2017-2017 | .239 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Edgar Olmos | 2012-2014 | .000 | 0 | 0 | 5 | 3 | 3 | 2.70 | 70 |
| Scott Olsen | 2005-2005 | .000 | 0 | 0 | 6 | 4 | 0 | 3.92 | 94 |
| Tyler Olson | 2014-2014 | .000 | 0 | 0 | 10 | 7 | 0 | 3.52 | 100 |
| Mike Olt | 2015-2015 | .444 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Olvera | 2046-2046 | .255 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Olvera | 2040-2043 | .198 | 34 | 98 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Omogrosso | 2008-2011 | .000 | 0 | 0 | 9 | 8 | 3 | 3.59 | 146 |
| Logan Ondrusek | 2006-2013 | .000 | 0 | 0 | 2 | 1 | 7 | 1.38 | 32 |
| Magglio Ordonez | 1996-1996 | .263 | 18 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Orihuela | 2043-2044 | .173 | 9 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ornelas | 2044-2044 | .000 | 0 | 0 | 8 | 9 | 0 | 2.90 | 121 |
| Rodolfo Ornelas | 2024-2024 | .304 | 26 | 104 | 0 | 0 | 0 | 0.00 | 0 |
| Nate Orocio | 2046-2046 | .245 | 3 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Orozco | 2027-2029 | .000 | 0 | 0 | 5 | 6 | 27 | 5.26 | 59 |
| Luis Orozco | 2041-2041 | .000 | 0 | 0 | 4 | 0 | 1 | 2.02 | 14 |
| Luis Orozco | 2046-2047 | .218 | 3 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Orr | 2046-2047 | .000 | 0 | 0 | 8 | 2 | 0 | 2.59 | 106 |
| Pete Orr | 2002-2017 | .240 | 5 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Arturo Ortega | 2041-2045 | .221 | 15 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2032-2032 | .204 | 4 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2047-2047 | .303 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2029-2029 | .275 | 14 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortega | 2044-2044 | .000 | 0 | 0 | 0 | 0 | 0 | 4.50 | 6 |
| Luis Ortega | 2034-2034 | .162 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Yonata Ortega | 2011-2012 | .000 | 0 | 0 | 3 | 2 | 2 | 5.79 | 69 |
| Devin Ortiz | 2037-2037 | .000 | 0 | 0 | 17 | 8 | 0 | 4.01 | 149 |
| Javier Ortiz | 2005-2005 | .000 | 0 | 0 | 2 | 1 | 0 | 3.52 | 7 |
| Luis Ortiz | 2016-2017 | .000 | 0 | 0 | 2 | 5 | 7 | 4.66 | 23 |
| Chad Orvella | 2004-2005 | .000 | 0 | 0 | 0 | 0 | 13 | 0.28 | 43 |
| Jamari Osagie | 2039-2047 | .248 | 48 | 144 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jon Osborne | 2040-2041 | .133 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Humberto Osorio | 2047-2047 | .600 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Osorio | 2042-2047 | .236 | 11 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Edgar Osuna | 2009-2009 | .333 | 0 | 0 | 4 | 4 | 0 | 3.72 | 49 |
| Ramon Osuna | 2018-2019 | .310 | 44 | 174 | 0 | 0 | 0 | 0.00 | 0 |
| Willis Otanez | 1995-2001 | .260 | 13 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Othon | 2037-2038 | .288 | 7 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Outman | 2015-2015 | .000 | 0 | 0 | 0 | 1 | 0 | 4.50 | 3 |
| Luis Ovalle | 2025-2025 | .000 | 0 | 0 | 1 | 2 | 19 | 1.97 | 31 |
| Luis Ovalles | 2033-2033 | .000 | 0 | 0 | 0 | 0 | 3 | 0.00 | 6 |
| Lyle Overbay | 2000-2001 | .352 | 21 | 149 | 0 | 0 | 0 | 0.00 | 0 |
| Travis Overturf | 2046-2046 | .000 | 0 | 0 | 0 | 1 | 0 | 27.00 | 1 |
| Jerry Owens | 2005-2005 | .331 | 2 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Owings | 2012-2012 | .263 | 6 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Micah Owings | 2013-2014 | .190 | 1 | 3 | 1 | 1 | 0 | 3.14 | 21 |
| Dwain Owry | 2038-2038 | .000 | 0 | 0 | 9 | 12 | 0 | 4.19 | 172 |
| Ajani Owusu | 2038-2038 | .257 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Oxspring | 2002-2003 | .000 | 0 | 0 | 10 | 6 | 0 | 2.76 | 150 |
| Marcell Ozuna | 2013-2013 | .333 | 5 | 15 | 0 | 0 | 0 | 0.00 | 0 |
