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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 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Riley O'Brien | 2020-2020 | .000 | 0 | 0 | 2 | 5 | 0 | 4.32 | 90 |
| Brian O'Grady | 2020-2020 | .143 | 16 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan O'Hearn | 2020-2020 | .257 | 21 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Brian O'Keefe | 2020-2020 | .189 | 8 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Trevor Oaks | 2020-2020 | .000 | 0 | 0 | 2 | 3 | 1 | 3.38 | 99 |
| Bailey Ober | 2020-2020 | .000 | 0 | 0 | 2 | 3 | 0 | 3.81 | 66 |
| Josh Ockimey | 2020-2020 | .220 | 35 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Okert | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 3 | 5.40 | 10 |
| Jared Oliva | 2020-2020 | .238 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Edward Olivares | 2020-2020 | .232 | 16 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Keith Orlandi | 2020-2020 | .091 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Rodrigo Orozco | 2020-2020 | .233 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Ortega | 2020-2020 | .231 | 11 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Jhailyn Ortiz | 2020-2020 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Osuna | 2020-2020 | .281 | 9 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Corey Oswalt | 2020-2020 | .000 | 0 | 0 | 2 | 1 | 0 | 6.16 | 32 |
| Jack Owen | 2020-2020 | .000 | 0 | 0 | 5 | 4 | 3 | 4.69 | 98 |
