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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Riley O'Brien | 2020-2020 | 6 | 5 | .545 | 4.28 | 22 | 18 | 0 | 0 | 0 | 96.2 | 89 | 46 | 13 | 42 | 110 |
| Darren O'Day | 2020-2020 | 4 | 1 | .800 | 6.08 | 39 | 0 | 0 | 0 | 0 | 40.0 | 52 | 27 | 5 | 16 | 49 |
| Tyler O'Neill | 2020-2020 | 0 | 0 | .000 | 9.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 2 | 1 | 0 | 1 | 1 |
| Scott Oberg | 2020-2020 | 6 | 6 | .500 | 3.05 | 65 | 0 | 0 | 0 | 1 | 73.2 | 66 | 25 | 7 | 27 | 83 |
| Jake Odorizzi | 2020-2020 | 7 | 11 | .389 | 6.03 | 31 | 31 | 0 | 0 | 0 | 158.1 | 188 | 106 | 39 | 56 | 171 |
| Shohei Ohtani | 2020-2020 | 11 | 9 | .550 | 4.09 | 29 | 29 | 0 | 0 | 0 | 174.0 | 152 | 79 | 30 | 54 | 221 |
| Roberto Osuna | 2020-2020 | 6 | 2 | .750 | 3.09 | 63 | 0 | 0 | 0 | 23 | 67.0 | 68 | 23 | 11 | 10 | 82 |
| Adam Ottavino | 2020-2020 | 2 | 5 | .286 | 6.34 | 83 | 0 | 0 | 0 | 1 | 76.2 | 87 | 54 | 14 | 56 | 129 |
