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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 |
|---|---|---|---|---|---|---|---|---|---|
| Rusty O'Callahan | 2030-2030 | .000 | 0 | 0 | 5 | 4 | 0 | 3.56 | 66 |
| Tim O'Connor | 2032-2034 | .319 | 5 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Bryce O'Donnell | 2039-2039 | .383 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Joel O'Donnell | 2023-2029 | .300 | 9 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Dennis O'Farrell | 2035-2036 | .000 | 0 | 0 | 2 | 4 | 1 | 1.48 | 47 |
| John O'Keefe | 2031-2034 | .224 | 6 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Ben O'Leary | 2031-2032 | .335 | 6 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan O'Malley | 2039-2039 | .000 | 0 | 0 | 0 | 0 | 0 | 4.22 | 2 |
| Gordie O'Neil | 2031-2035 | .000 | 0 | 0 | 7 | 3 | 6 | 3.44 | 90 |
| Matt Oakes | 2022-2026 | .277 | 15 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Rob Oakes | 2032-2032 | .000 | 0 | 0 | 1 | 7 | 0 | 8.25 | 35 |
| Andrew Obey | 2036-2038 | .324 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Obregon | 2026-2028 | .272 | 5 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Matthew Obrzut | 2035-2036 | .000 | 0 | 0 | 2 | 6 | 8 | 11.00 | 20 |
| Jon Ocampo | 2027-2031 | .000 | 0 | 0 | 14 | 8 | 0 | 4.64 | 100 |
| Tony Ocampo | 2038-2039 | .264 | 5 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ocasio | 2036-2037 | .000 | 0 | 0 | 2 | 0 | 1 | 4.70 | 40 |
| Israel Occhena | 2022-2030 | .000 | 0 | 0 | 2 | 0 | 7 | 4.33 | 32 |
| Danny Ochoa | 2032-2033 | .269 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Joel Ochoa | 2028-2029 | .245 | 1 | 15 | 0 | 0 | 0 | 14.29 | 2 |
| Sergio Ochoa | 2030-2032 | .000 | 0 | 0 | 3 | 1 | 1 | 5.33 | 75 |
| Dan Odom | 2035-2035 | .312 | 4 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Derrick Odom | 2033-2033 | .000 | 0 | 0 | 3 | 1 | 1 | 3.57 | 36 |
| Eli Oelke | 2025-2026 | .307 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Sidney Offredi | 2038-2039 | .279 | 9 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Ohnemus | 2034-2034 | .359 | 7 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Dusty Oker | 2026-2027 | .246 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Oldenburg | 2037-2038 | .360 | 16 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Kyle Oleske | 2029-2031 | .306 | 5 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Olguin | 2033-2033 | .000 | 0 | 0 | 0 | 0 | 1 | 1.17 | 5 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Bill Oliva | 2029-2030 | .000 | 0 | 0 | 1 | 6 | 0 | 7.36 | 34 |
| Corey Oliva | 2023-2023 | .000 | 0 | 0 | 1 | 1 | 0 | 9.00 | 15 |
| Luis Olivares | 2023-2023 | .267 | 7 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Marco Olivera | 2032-2032 | .335 | 3 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Olsen | 2036-2036 | .000 | 0 | 0 | 1 | 2 | 0 | 7.20 | 9 |
| Travis Olsen | 2035-2035 | .258 | 3 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Olson | 2022-2022 | .000 | 0 | 0 | 0 | 4 | 0 | 12.27 | 25 |
| Tom Olson | 2037-2037 | .235 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Ondrasek | 2036-2037 | .337 | 17 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Oney | 2030-2030 | .000 | 0 | 0 | 2 | 6 | 0 | 4.62 | 60 |
| Juan Ontiveros | 2035-2039 | .000 | 0 | 0 | 0 | 4 | 0 | 7.11 | 29 |
| Terrence Ooze | 2028-2034 | .000 | 0 | 0 | 8 | 12 | 28 | 4.18 | 100 |
| Ryan Opfer | 2035-2035 | .319 | 8 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Orange | 2038-2039 | .310 | 4 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Ordonez | 2033-2033 | .000 | 0 | 0 | 0 | 0 | 1 | 4.66 | 14 |
| Francisco Orea | 2033-2033 | .295 | 7 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Orozco | 2022-2027 | .202 | 5 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Antonio Orozco | 2033-2033 | .000 | 0 | 0 | 2 | 1 | 0 | 4.64 | 25 |
| Manny Orozco | 2022-2025 | .000 | 0 | 0 | 11 | 11 | 1 | 4.24 | 131 |
| Manny Orta | 2022-2026 | .338 | 6 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Ortega | 2024-2027 | .000 | 0 | 0 | 6 | 6 | 0 | 3.56 | 91 |
| Carlos Ortega | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 7.71 | 3 |
| David Ortega | 2038-2038 | .255 | 3 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Edwin Ortega | 2030-2031 | .368 | 1 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Ricky Ortega | 2032-2037 | .256 | 5 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Ruben Ortega | 2032-2032 | .500 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Ortiz | 2038-2039 | .308 | 6 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Jesus Ortiz | 2022-2024 | .000 | 0 | 0 | 4 | 2 | 1 | 4.08 | 45 |
| Nick Ortiz | 2039-2039 | .000 | 0 | 0 | 3 | 5 | 0 | 3.38 | 34 |
| Roberto Ortiz | 2034-2038 | .000 | 0 | 0 | 11 | 6 | 20 | 4.32 | 117 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Santiago Ortiz | 2027-2031 | .000 | 0 | 0 | 10 | 12 | 0 | 4.66 | 131 |
| Victor Ortiz | 2034-2036 | .236 | 24 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Orzo | 2038-2038 | .000 | 0 | 0 | 0 | 8 | 0 | 7.87 | 33 |
| Antonio Oseguera | 2037-2039 | .275 | 23 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Osorio | 2027-2028 | .000 | 0 | 0 | 1 | 5 | 1 | 5.74 | 69 |
| Steve Ost | 2031-2032 | .339 | 5 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Melvin Ovalle | 2027-2030 | .205 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ovevedo | 2022-2025 | .281 | 7 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Oxendine | 2039-2039 | .000 | 0 | 0 | 0 | 0 | 0 | 1.93 | 10 |
| Nate Ozuna | 2034-2034 | .285 | 4 | 32 | 0 | 0 | 0 | 0.00 | 0 |
