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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 |
|---|---|---|---|---|---|---|---|---|---|
| Peter O'Brien | 2020-2020 | .192 | 7 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Jamal O'Guinn | 2020-2020 | .182 | 5 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Gavin Ochoa | 2020-2020 | .000 | 0 | 0 | 1 | 2 | 1 | 5.68 | 22 |
| Nate Ocker | 2020-2020 | .000 | 0 | 0 | 0 | 1 | 0 | 6.75 | 1 |
| Ernie Offenburger | 2020-2020 | .172 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Braeden Ogle | 2020-2020 | .000 | 0 | 0 | 1 | 1 | 0 | 2.15 | 49 |
| Pablo Olivares | 2020-2020 | .203 | 7 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Helcris Olivarez | 2020-2020 | .000 | 0 | 0 | 0 | 2 | 10 | 2.57 | 70 |
| Jon Olsen | 2020-2020 | .000 | 0 | 0 | 6 | 2 | 0 | 2.81 | 58 |
| Jesus Orecchia | 2020-2020 | .220 | 4 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Ornelas | 2020-2020 | .246 | 1 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Tirso Ornelas | 2020-2020 | .217 | 10 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Jio Orozco | 2020-2020 | .000 | 0 | 0 | 7 | 12 | 0 | 3.68 | 190 |
| Luis Orozco | 2020-2020 | .214 | 4 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Joseph Ortiz | 2020-2020 | .226 | 3 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Robinson Ortiz | 2020-2020 | .000 | 0 | 0 | 1 | 6 | 1 | 2.53 | 157 |
| Michael Osinski | 2020-2020 | .255 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Bryce Osmond | 2020-2020 | .250 | 0 | 0 | 2 | 1 | 0 | 2.93 | 31 |
| Michel Otanez | 2020-2020 | .000 | 0 | 0 | 8 | 3 | 2 | 3.08 | 110 |
| Glenn Otto | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 21.60 | 2 |
| Jeremy Ovalle | 2020-2020 | .000 | 0 | 0 | 4 | 2 | 0 | 3.03 | 42 |
| Adam Oviedo | 2020-2020 | .248 | 3 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Johan Oviedo | 2020-2020 | .000 | 0 | 0 | 5 | 1 | 0 | 1.55 | 110 |
| Hunter Owen | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 1 | 3.63 | 20 |
| Hunter Owen | 2020-2020 | .259 | 9 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Noah Owen | 2020-2020 | .000 | 0 | 0 | 1 | 1 | 0 | 2.00 | 19 |
| Ian Oxnevad | 2020-2020 | .000 | 0 | 0 | 1 | 2 | 1 | 9.00 | 14 |
