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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 |
|---|---|---|---|---|---|---|---|---|---|
| Mike O'Brien | 2040-2042 | .000 | 0 | 0 | 5 | 3 | 0 | 2.70 | 80 |
| Mike O'Brien | 2023-2023 | .000 | 0 | 0 | 6 | 1 | 3 | 3.45 | 67 |
| Shamar O'Conner | 2025-2025 | .274 | 5 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Darren O'Day | 2007-2007 | .000 | 0 | 0 | 4 | 0 | 11 | 0.75 | 26 |
| Nick O'Day | 2021-2021 | .000 | 0 | 0 | 1 | 3 | 0 | 5.82 | 27 |
| Geoff O'Donoghue | 2042-2042 | .163 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Flaherty | 2014-2015 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 3 |
| Chris O'Grady | 2014-2014 | .000 | 0 | 0 | 4 | 4 | 5 | 3.33 | 81 |
| Jason O'Hagan | 2047-2047 | .000 | 0 | 0 | 0 | 0 | 0 | 1.35 | 10 |
| Chris O'Hanlon | 2045-2046 | .272 | 15 | 101 | 0 | 0 | 1 | 3.69 | 12 |
| Alpha O'Kelley | 2044-2044 | .000 | 0 | 0 | 3 | 2 | 0 | 3.62 | 28 |
| Jonathan O'Neal | 2043-2045 | .000 | 0 | 0 | 9 | 4 | 3 | 3.74 | 182 |
| Marc O'Neal | 2029-2030 | .000 | 0 | 0 | 4 | 10 | 27 | 4.06 | 96 |
| Tyler O'Neill | 2015-2015 | .260 | 32 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Sean O'Sullivan | 2008-2008 | .000 | 0 | 0 | 16 | 8 | 0 | 4.73 | 111 |
| Kevin O'Tey | 2027-2027 | .313 | 24 | 131 | 0 | 0 | 0 | 0.00 | 0 |
| Trevor Oaks | 2015-2021 | .000 | 0 | 0 | 12 | 9 | 4 | 5.27 | 178 |
| Andy Oberg | 2043-2043 | .000 | 0 | 0 | 7 | 1 | 8 | 2.41 | 50 |
| Scott Oberg | 2013-2013 | .000 | 0 | 0 | 1 | 6 | 33 | 1.86 | 61 |
| Sergio Ocana | 2046-2046 | .000 | 0 | 0 | 4 | 5 | 0 | 5.35 | 46 |
| Vito Ocasio | 2032-2033 | .298 | 13 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Occhiuto | 2045-2047 | .000 | 0 | 0 | 19 | 21 | 8 | 3.67 | 266 |
| Esteban Ochoa | 2045-2046 | .265 | 8 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ochoa | 2030-2030 | .289 | 6 | 56 | 0 | 0 | 0 | 0.00 | 2 |
| Juan Ochoa | 2043-2043 | .255 | 21 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Ockimey | 2017-2019 | .309 | 34 | 141 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Oduro | 2037-2037 | .328 | 6 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Pat Oglesby | 2046-2047 | .000 | 0 | 0 | 4 | 5 | 0 | 5.00 | 63 |
| Will Ohman | 2009-2009 | .000 | 0 | 0 | 0 | 0 | 0 | 13.50 | 2 |
| Steven Okert | 2014-2014 | .000 | 0 | 0 | 1 | 2 | 19 | 1.53 | 54 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jeremy Okray | 2025-2030 | .288 | 9 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Murdock Oldford | 2046-2047 | .195 | 4 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Olivas | 2034-2036 | .241 | 0 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Ray Olmedo | 2001-2001 | .244 | 0 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Olson | 2043-2043 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Olson | 2014-2014 | .262 | 37 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Olson | 2014-2014 | .000 | 0 | 0 | 2 | 1 | 0 | 3.13 | 27 |
| Logan Ondrusek | 2007-2009 | .000 | 0 | 0 | 10 | 17 | 2 | 4.33 | 156 |
| Lupe Onofre | 2041-2041 | .281 | 14 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ordorica | 2034-2035 | .210 | 19 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Orihuela | 2042-2046 | .226 | 30 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ornelas | 2030-2030 | .250 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Tirso Ornelas | 2022-2022 | .421 | 5 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Oropeza | 2047-2047 | .167 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Orosco | 2043-2047 | .206 | 27 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Orozco | 2047-2047 | .000 | 0 | 0 | 1 | 0 | 0 | 7.04 | 8 |
| Luis Orozco | 2037-2038 | .000 | 0 | 0 | 2 | 4 | 14 | 7.77 | 51 |
| Alfredo Ortega | 2026-2026 | .317 | 15 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Anthony Ortega | 2006-2007 | .000 | 0 | 0 | 7 | 11 | 1 | 3.92 | 132 |
| Juan Ortega | 2045-2047 | .214 | 14 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2027-2028 | .256 | 28 | 143 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortega | 2043-2046 | .000 | 0 | 0 | 23 | 12 | 0 | 2.71 | 381 |
| Rafael Ortega | 2012-2012 | .283 | 8 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Yonata Ortega | 2010-2011 | .000 | 0 | 0 | 4 | 2 | 20 | 3.98 | 73 |
| Joe Ortiz | 2010-2010 | .000 | 0 | 0 | 0 | 0 | 0 | 3.86 | 4 |
| Jose Ortiz | 1996-1997 | .246 | 16 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortiz | 2016-2016 | .000 | 0 | 0 | 3 | 2 | 0 | 2.60 | 28 |
| Noel Ortiz | 2019-2024 | .000 | 0 | 0 | 13 | 10 | 20 | 5.41 | 181 |
| Ramon Ortiz | 2000-2005 | .000 | 0 | 0 | 1 | 1 | 0 | 5.00 | 10 |
| Russ Ortiz | 1995-2007 | .000 | 0 | 0 | 0 | 2 | 23 | 2.39 | 76 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Chad Orvella | 2004-2004 | .000 | 0 | 0 | 0 | 1 | 4 | 3.06 | 24 |
| Andy Osborne | 2043-2043 | .333 | 5 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Osich | 2012-2013 | .000 | 0 | 0 | 3 | 3 | 13 | 2.97 | 82 |
| Rusty Osika | 2039-2039 | .276 | 7 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Osornia | 2041-2044 | .256 | 57 | 213 | 0 | 0 | 0 | 0.00 | 0 |
| Arturo Ospina | 2044-2045 | .000 | 0 | 0 | 4 | 16 | 1 | 6.32 | 137 |
| Willis Otanez | 1992-1995 | .256 | 42 | 191 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Otero | 2008-2010 | .000 | 0 | 0 | 4 | 1 | 16 | 3.79 | 34 |
| Adam Ottavino | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 1 | 6.75 | 6 |
| Josh Outman | 2012-2012 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Jake Overstreet | 2043-2043 | .311 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Kyle Overstreet | 2020-2020 | .346 | 5 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Dillon Overton | 2015-2015 | .000 | 0 | 0 | 2 | 4 | 0 | 3.82 | 59 |
| Gilberto Oviedo | 2030-2031 | .000 | 0 | 0 | 4 | 5 | 0 | 6.00 | 56 |
| Brad Owens | 2030-2030 | .000 | 0 | 0 | 0 | 6 | 0 | 11.37 | 19 |
| Jeremy Owens | 2046-2047 | .249 | 6 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Rudy Owens | 2015-2015 | .000 | 0 | 0 | 0 | 1 | 0 | 4.32 | 7 |
| Chris Owings | 2011-2023 | .270 | 27 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Ricky Owings | 2041-2046 | .244 | 91 | 226 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Oxspring | 2001-2002 | .000 | 0 | 0 | 0 | 1 | 0 | 3.35 | 47 |
| Luis Oyoque | 2042-2042 | .271 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
