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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Eddie O'Connor | 2025-2026 | 10 | 6 | .625 | 2.52 | 85 | 26 | 0 | 0 | 21 | 117.2 | 111 | 33 | 3 | 14 | 99 |
| Jeff O'Donovan | 2025-2026 | 15 | 18 | .455 | 5.05 | 87 | 19 | 1 | 0 | 39 | 183.2 | 224 | 103 | 23 | 79 | 142 |
| Willie Ocasio | 2024-2025 | 5 | 1 | .833 | 7.71 | 20 | 3 | 0 | 0 | 1 | 49.0 | 71 | 42 | 12 | 22 | 36 |
| Alvaro Ochoa | 2024-2024 | 11 | 7 | .611 | 5.48 | 31 | 18 | 0 | 0 | 1 | 116.2 | 139 | 71 | 16 | 49 | 103 |
| Carlos Ochoa | 2026-2026 | 5 | 7 | .417 | 4.62 | 18 | 10 | 0 | 0 | 0 | 87.2 | 95 | 45 | 9 | 24 | 55 |
| Jesus Ochoa | 2025-2025 | 6 | 2 | .750 | 3.84 | 35 | 0 | 0 | 0 | 7 | 75.0 | 86 | 32 | 5 | 24 | 66 |
| Alex Olivas | 2024-2024 | 5 | 3 | .625 | 4.81 | 21 | 21 | 0 | 0 | 0 | 88.0 | 87 | 47 | 17 | 53 | 74 |
| Jose Olvera | 2025-2025 | 0 | 1 | .000 | 9.00 | 2 | 2 | 0 | 0 | 0 | 7.0 | 11 | 7 | 2 | 3 | 1 |
| Carlos Orosco | 2024-2025 | 4 | 4 | .500 | 7.01 | 25 | 21 | 0 | 0 | 0 | 113.0 | 157 | 88 | 20 | 50 | 77 |
| Luis Orosco | 2025-2026 | 6 | 7 | .462 | 5.28 | 35 | 18 | 0 | 0 | 0 | 124.1 | 173 | 73 | 22 | 45 | 44 |
| Ricardo Orozco | 2025-2026 | 6 | 15 | .286 | 7.88 | 37 | 31 | 0 | 0 | 0 | 158.2 | 249 | 139 | 44 | 84 | 23 |
| Gabe Ortega | 2026-2026 | 0 | 0 | .000 | 5.00 | 2 | 2 | 0 | 0 | 0 | 9.0 | 11 | 5 | 1 | 3 | 6 |
| Jesus Ortiz | 2026-2026 | 1 | 1 | .500 | 5.91 | 3 | 0 | 0 | 0 | 0 | 10.2 | 10 | 7 | 2 | 6 | 7 |
| Eric Osborne | 2026-2026 | 2 | 7 | .222 | 5.44 | 24 | 11 | 0 | 0 | 0 | 86.0 | 109 | 52 | 9 | 36 | 57 |
| Matt Osborne | 2024-2024 | 3 | 2 | .600 | 4.01 | 13 | 13 | 1 | 1 | 0 | 67.1 | 69 | 30 | 8 | 19 | 51 |
| Tatsuya Oshima | 2024-2024 | 5 | 1 | .833 | 5.40 | 24 | 0 | 0 | 0 | 4 | 31.2 | 42 | 19 | 2 | 18 | 22 |
| Jorge Ospina | 2026-2026 | 0 | 0 | .000 | 4.21 | 36 | 0 | 0 | 0 | 1 | 57.2 | 68 | 27 | 10 | 21 | 45 |
| Johnny Owen | 2025-2025 | 0 | 0 | .000 | 6.30 | 4 | 0 | 0 | 0 | 0 | 10.0 | 18 | 7 | 5 | 1 | 4 |
| Shinpei Oyama | 2025-2025 | 3 | 1 | .750 | 7.44 | 15 | 0 | 0 | 0 | 0 | 32.2 | 52 | 27 | 3 | 23 | 14 |
| Cortez Oyola | 2024-2024 | 4 | 6 | .400 | 9.27 | 26 | 0 | 0 | 0 | 0 | 44.2 | 78 | 46 | 16 | 12 | 18 |
