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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 |
|---|---|---|---|---|---|---|---|---|---|
| Chad O'Brien | 2016-2017 | .230 | 4 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Donnell | 2016-2017 | .000 | 0 | 0 | 0 | 2 | 2 | 2.15 | 43 |
| Erik O'Neil | 2016-2016 | .215 | 1 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Brooks O'Shields | 2016-2017 | .000 | 0 | 0 | 8 | 9 | 60 | 2.34 | 152 |
| Norberto Obeso | 2016-2016 | .269 | 0 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Rougned J. Odor | 2016-2016 | .200 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Ogden | 2016-2017 | .000 | 0 | 0 | 5 | 4 | 9 | 1.58 | 103 |
| Chris Okey | 2016-2017 | .308 | 4 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Oliver | 2016-2017 | .000 | 0 | 0 | 6 | 8 | 13 | 3.00 | 116 |
| Dallas Oliver | 2016-2017 | .181 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Cody Olsen | 2016-2017 | .000 | 0 | 0 | 6 | 9 | 0 | 2.96 | 121 |
| Ryan Olson | 2016-2017 | .000 | 0 | 0 | 3 | 3 | 3 | 3.81 | 62 |
| Magglio Ordonez Jr. | 2017-2017 | .241 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ormsbee | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 4.30 | 12 |
| Luis D. Ortega | 2016-2016 | .000 | 0 | 0 | 3 | 2 | 8 | 3.82 | 66 |
| Jhailyn Ortiz | 2016-2017 | .182 | 13 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Mitchell Ough | 2016-2017 | .000 | 0 | 0 | 13 | 5 | 0 | 1.78 | 193 |
| Johan Oviedo | 2017-2017 | .000 | 0 | 0 | 0 | 4 | 0 | 4.85 | 26 |
| Tim Owens | 2017-2017 | .215 | 2 | 24 | 0 | 0 | 0 | 0.00 | 0 |
