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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 |
|---|---|---|---|---|---|---|---|---|---|
| Francisco O'Brien | 2024-2024 | .315 | 19 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Eddie O'Connor | 2025-2026 | .000 | 0 | 0 | 5 | 4 | 14 | 3.43 | 41 |
| Tim O'Connor | 2024-2025 | .311 | 10 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff O'Donovan | 2025-2026 | .000 | 0 | 0 | 9 | 9 | 11 | 4.77 | 96 |
| Dillon O'Neill | 2024-2026 | .313 | 23 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Willie Ocasio | 2024-2025 | .000 | 0 | 0 | 5 | 1 | 1 | 7.71 | 36 |
| Alvaro Ochoa | 2024-2024 | .000 | 0 | 0 | 11 | 7 | 1 | 5.48 | 103 |
| Carlos Ochoa | 2026-2026 | .000 | 0 | 0 | 0 | 1 | 0 | 5.79 | 2 |
| Jesus Ochoa | 2025-2025 | .000 | 0 | 0 | 6 | 2 | 7 | 3.84 | 66 |
| Mike Ogan | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Ogden | 2024-2024 | .389 | 6 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Bruce Ogie | 2024-2024 | .227 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Toshiaki Ogura | 2024-2025 | .233 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshio Okazaki | 2024-2025 | .571 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Juichi Okuyama | 2024-2024 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Olivas | 2024-2024 | .000 | 0 | 0 | 5 | 3 | 0 | 4.81 | 74 |
| Chris Oliver | 2024-2024 | .500 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Olvera | 2025-2025 | .000 | 0 | 0 | 0 | 1 | 0 | 9.00 | 1 |
| Luis Olvera | 2026-2026 | .267 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Ontiveros | 2024-2024 | .444 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Victor Ontiveros | 2024-2025 | .285 | 9 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Orosco | 2024-2025 | .000 | 0 | 0 | 4 | 4 | 0 | 7.01 | 77 |
| Dave Orosco | 2025-2026 | .174 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Orosco | 2025-2026 | .000 | 0 | 0 | 1 | 1 | 0 | 5.82 | 15 |
| Ricardo Orozco | 2025-2025 | .000 | 0 | 0 | 0 | 4 | 0 | 9.48 | 1 |
| Gabe Ortega | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 5.79 | 1 |
| Luis Ortega | 2026-2026 | .267 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Andrew Ortiz | 2024-2025 | .298 | 29 | 129 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Ortiz | 2025-2026 | .269 | 9 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Omar Ortiz | 2025-2025 | .312 | 6 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Eric Osborne | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 3 |
| Matt Osborne | 2024-2024 | .000 | 0 | 0 | 3 | 2 | 0 | 4.01 | 51 |
| Tatsuya Oshima | 2024-2024 | .000 | 0 | 0 | 5 | 1 | 4 | 5.40 | 22 |
| Shinichi Ota | 2024-2025 | .289 | 10 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny Owen | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 6.30 | 4 |
| Chris Owens | 2024-2024 | .167 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Dustin Owens | 2025-2026 | .281 | 23 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Owens | 2024-2024 | .351 | 7 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Shinpei Oyama | 2025-2025 | .000 | 0 | 0 | 3 | 1 | 0 | 7.44 | 14 |
| Cortez Oyola | 2024-2024 | .000 | 0 | 0 | 4 | 6 | 0 | 9.27 | 18 |
