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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 |
|---|---|---|---|---|---|---|---|---|---|
| Caden O'Brien | 2020-2020 | .000 | 0 | 0 | 1 | 2 | 1 | 2.42 | 29 |
| Jack O'Connor | 2020-2020 | .000 | 0 | 0 | 1 | 2 | 0 | 3.98 | 46 |
| Devin Obee | 2020-2020 | .429 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Keshawn Ogans | 2020-2020 | .237 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Pierson Ohl | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 2.25 | 7 |
| Chris Okey | 2020-2020 | 1.000 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Wyatt Olds | 2020-2020 | .000 | 0 | 0 | 3 | 1 | 0 | 2.23 | 61 |
| Joe Oliver | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Olson | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Braden Olthoff | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 7.71 | 3 |
| Nick Olvera | 2020-2020 | .190 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Gunn Omosako | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Ondina | 2020-2020 | .229 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Sebastian Orduno | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jesus Orecchia | 2020-2020 | .222 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Keith Orlandi | 2020-2020 | .193 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Kyle Orr | 2020-2020 | .000 | 0 | 0 | 1 | 3 | 1 | 5.30 | 45 |
| Teodoro Ortega | 2020-2020 | .000 | 0 | 0 | 3 | 0 | 4 | 0.75 | 30 |
| Ayendy Ortiz | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Devin Ortiz | 2020-2020 | .278 | 1 | 2 | 0 | 1 | 0 | 5.40 | 13 |
| Luis Ortiz | 2020-2020 | .000 | 0 | 0 | 2 | 1 | 3 | 2.54 | 31 |
| Yanluis Ortiz | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 3 |
| Graham Osman | 2020-2020 | .000 | 0 | 0 | 1 | 1 | 2 | 2.73 | 28 |
| Bryce Osmond | 2020-2020 | .000 | 0 | 0 | 0 | 3 | 0 | 5.21 | 21 |
| Jan Carlos Osorio | 2020-2020 | .157 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ostos | 2020-2020 | .209 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Luilly Ovalle | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 9.00 | 3 |
| Tyler Owens | 2020-2020 | .000 | 0 | 0 | 2 | 4 | 0 | 4.50 | 50 |
| Elvin Ozoria | 2020-2020 | .290 | 4 | 21 | 0 | 0 | 0 | 0.00 | 0 |
