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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 | 10 | 6 | 21 | 2.52 | 99 |
| Tim O'Connor | 2024-2026 | .334 | 23 | 129 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff O'Donovan | 2025-2026 | .000 | 0 | 0 | 15 | 18 | 39 | 5.05 | 142 |
| Billy O'Neal | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dillon O'Neill | 2024-2026 | .359 | 51 | 159 | 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 | 5 | 7 | 0 | 4.62 | 55 |
| 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 | 2024-2026 | .444 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Juichi Okuyama | 2024-2024 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Oliva | 2026-2026 | .214 | 0 | 0 | 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 | .284 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Ontiveros | 2024-2024 | .444 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Victor Ontiveros | 2024-2026 | .291 | 22 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| Wallace Oram | 2026-2026 | .194 | 7 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Orosco | 2024-2025 | .000 | 0 | 0 | 4 | 4 | 0 | 7.01 | 77 |
| Dave Orosco | 2025-2026 | .267 | 7 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Orosco | 2025-2026 | .000 | 0 | 0 | 6 | 7 | 0 | 5.28 | 44 |
| Ricardo Orozco | 2025-2026 | .000 | 0 | 0 | 6 | 15 | 0 | 7.88 | 23 |
| Tyler Orr | 2026-2026 | .269 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Ortega | 2026-2026 | .167 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Gabe Ortega | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 5.00 | 6 |
| Jose Ortega | 2026-2026 | .267 | 3 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortega | 2026-2026 | .382 | 10 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Andrew Ortiz | 2024-2025 | .298 | 29 | 129 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Ortiz | 2025-2026 | .291 | 26 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Jesus Ortiz | 2026-2026 | .000 | 0 | 0 | 1 | 1 | 0 | 5.91 | 7 |
| Mike Ortiz | 2026-2026 | .263 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Omar Ortiz | 2025-2025 | .312 | 6 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Rico Ortiz | 2026-2026 | .125 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Eric Osborne | 2026-2026 | .000 | 0 | 0 | 2 | 7 | 0 | 5.44 | 57 |
| 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 |
| Jerry Osnaya | 2026-2026 | .217 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ospina | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 1 | 4.21 | 45 |
| Shinichi Ota | 2024-2025 | .289 | 10 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Owczarzak | 2026-2026 | .111 | 0 | 0 | 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 | .287 | 37 | 108 | 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 |
