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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 |
|---|---|---|---|---|---|---|---|---|---|
| Patrick O'Brien | 2023-2023 | .000 | 0 | 0 | 1 | 0 | 0 | 2.19 | 19 |
| Alex O'Connell | 2020-2020 | .318 | 7 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Justin O'Conner | 2015-2015 | .277 | 29 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Day | 2023-2023 | .000 | 0 | 0 | 2 | 0 | 0 | 3.26 | 14 |
| John O'Day | 2014-2015 | .000 | 0 | 0 | 5 | 2 | 0 | 6.01 | 53 |
| Donald O'Dell | 2019-2020 | .290 | 28 | 136 | 0 | 0 | 0 | 0.00 | 0 |
| Duncan O'Dell | 2023-2023 | .267 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Herlihy | 2022-2022 | .235 | 6 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Dustin O'Neal | 2014-2016 | .274 | 25 | 133 | 0 | 0 | 0 | 0.00 | 0 |
| Clayton O'Neil | 2020-2020 | .000 | 0 | 0 | 2 | 1 | 2 | 6.50 | 12 |
| Bruce O'Slattery | 2019-2023 | .000 | 0 | 0 | 9 | 11 | 5 | 3.57 | 177 |
| Sean O'Sullivan | 2012-2012 | .000 | 0 | 0 | 5 | 1 | 0 | 3.63 | 62 |
| Nathan Oats | 2023-2024 | .226 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Brett Oberholtzer | 2013-2013 | .000 | 0 | 0 | 4 | 4 | 0 | 4.07 | 80 |
| Ted Obregon | 2014-2015 | .348 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ochoa | 2021-2024 | .303 | 2 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Leonardo Ochoa | 2013-2013 | .269 | 5 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ochoa | 2020-2024 | .170 | 3 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Odorizzi | 2021-2022 | .000 | 0 | 0 | 3 | 1 | 0 | 2.73 | 31 |
| Mike Ogden | 2018-2019 | .225 | 22 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Okuda | 2014-2014 | .239 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Olbryc | 2020-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 2.70 | 27 |
| Lester Oliveros | 2014-2014 | .000 | 0 | 0 | 3 | 0 | 2 | 4.94 | 23 |
| Whit Olmstead | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Casey Opitz | 2024-2024 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ordiales | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Cody Orgeron | 2022-2022 | .311 | 4 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2021-2021 | .322 | 6 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Ortega | 2013-2020 | .000 | 0 | 0 | 1 | 0 | 3 | 6.43 | 8 |
| Daniel Ortiz | 2012-2015 | .306 | 16 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Esteban Ortíz | 2019-2023 | .262 | 10 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Lawrence Ortíz | 2022-2023 | .000 | 0 | 0 | 3 | 3 | 0 | 5.71 | 51 |
| Manuel Ortíz | 2023-2024 | .295 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Bubba Osborn | 2020-2020 | .274 | 9 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Hiroya Oshima | 2013-2020 | .260 | 28 | 156 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Otero | 2015-2015 | .000 | 0 | 0 | 1 | 2 | 1 | 3.60 | 29 |
| Juan Carlos Oviedo | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Bryan Owen | 2021-2023 | .233 | 16 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Owings | 2012-2015 | .306 | 12 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Marcell Ozuna | 2012-2012 | .252 | 10 | 54 | 0 | 0 | 0 | 0.00 | 0 |
