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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 |
|---|---|---|---|---|---|---|---|---|---|
| Devin O'Brien | 2024-2031 | .000 | 0 | 0 | 40 | 30 | 8 | 3.97 | 694 |
| Harold O'Brien | 2035-2037 | .173 | 3 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Jake O'Brien | 2027-2032 | .222 | 19 | 91 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy O'Brien | 2030-2031 | .265 | 4 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Brien | 2021-2021 | .000 | 0 | 0 | 1 | 1 | 0 | 15.43 | 3 |
| Paul O'Brien | 2018-2018 | .146 | 2 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Jason O'Conner | 2035-2035 | .167 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Gabe O'Connor | 2029-2039 | .000 | 0 | 0 | 12 | 12 | 82 | 2.06 | 174 |
| Ben O'Daniell | 2031-2034 | .194 | 7 | 26 | 32 | 17 | 4 | 2.92 | 471 |
| Jim O'Donnell | 2025-2027 | .000 | 0 | 0 | 3 | 2 | 0 | 3.86 | 57 |
| Grant O'Halloran | 2018-2022 | .232 | 2 | 89 | 0 | 0 | 0 | 22.50 | 0 |
| Dan O'Keeffe | 2029-2030 | .000 | 0 | 0 | 16 | 4 | 0 | 3.57 | 157 |
| Jeremy O'Rourke | 2032-2032 | .250 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Corcoran O'Sullivan | 2033-2034 | .000 | 0 | 0 | 10 | 9 | 2 | 4.03 | 211 |
| Phil O'Sullivan | 2019-2021 | .000 | 0 | 0 | 8 | 16 | 0 | 5.13 | 159 |
| Rodrigo Ocampo | 2038-2041 | .212 | 7 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Ocheltree | 2026-2030 | .189 | 8 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Peter Ochoa | 2026-2027 | .260 | 6 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Willie Ochoa | 2018-2024 | .000 | 0 | 0 | 56 | 43 | 10 | 4.01 | 693 |
| Bobby Oder | 2035-2041 | .206 | 55 | 155 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Odin | 2018-2021 | .228 | 8 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Ogden | 2038-2041 | .000 | 0 | 0 | 25 | 21 | 0 | 3.20 | 459 |
| Steve Ogilvie | 2039-2041 | .000 | 0 | 0 | 23 | 15 | 0 | 2.88 | 457 |
| Ricky Ojeda | 2023-2025 | .000 | 0 | 0 | 1 | 2 | 0 | 5.77 | 34 |
| Jose Oliva | 2028-2031 | .218 | 1 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Rene Oliva | 2026-2039 | .311 | 62 | 152 | 0 | 0 | 0 | 0.00 | 0 |
| Billy Olivares | 2023-2030 | .000 | 0 | 0 | 15 | 24 | 3 | 4.74 | 349 |
| Marcos Olivas | 2033-2041 | .181 | 59 | 184 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby Oliver | 2020-2021 | .188 | 4 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Olivera | 2018-2019 | .000 | 0 | 0 | 4 | 2 | 0 | 3.93 | 81 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Mike Olivier | 2018-2021 | .271 | 60 | 204 | 0 | 0 | 0 | 0.00 | 0 |
| Angel Olmedo | 2018-2022 | .000 | 0 | 0 | 19 | 25 | 2 | 4.74 | 353 |
| Chase Olson | 2028-2030 | .000 | 0 | 0 | 3 | 1 | 1 | 3.00 | 29 |
| Jeffrey Olson | 2022-2023 | .282 | 1 | 29 | 3 | 0 | 1 | 3.86 | 36 |
| Matt Olson | 2018-2019 | .000 | 0 | 0 | 8 | 7 | 6 | 4.27 | 123 |
| Nick Olveda | 2040-2041 | .265 | 8 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Hee-seop On | 2024-2028 | .000 | 0 | 0 | 7 | 15 | 46 | 4.65 | 156 |
| Tomosaburo Ono | 2034-2034 | .174 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Leon Oosterhof | 2041-2041 | .252 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Luke Opperman | 2029-2030 | .185 | 10 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Reynaldo Orantes | 2034-2036 | .267 | 32 | 128 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Orlando | 2018-2018 | .262 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Ornelas | 2025-2036 | .255 | 6 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ornelas | 2018-2019 | .345 | 0 | 0 | 5 | 8 | 0 | 3.97 | 96 |
| Nelson Orona | 2027-2031 | .000 | 0 | 0 | 8 | 7 | 8 | 2.92 | 147 |
| Ivan Orozco | 2037-2037 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Rafael Orozco | 2030-2033 | .179 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Charlie Orr | 2025-2030 | .306 | 94 | 357 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Orr | 2034-2037 | .000 | 0 | 0 | 42 | 15 | 4 | 2.54 | 546 |
| Paul Orr | 2019-2022 | .236 | 26 | 119 | 0 | 0 | 0 | 0.00 | 0 |
| Rob Orrico | 2038-2038 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Ortega | 2022-2028 | .255 | 15 | 139 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ortega | 2018-2022 | .255 | 27 | 137 | 0 | 0 | 0 | 27.00 | 2 |
| Orlando Ortega | 2030-2035 | .217 | 6 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortega | 2026-2031 | .234 | 3 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Leon Orth | 2027-2030 | .270 | 12 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Antonio Ortiz | 2027-2030 | .295 | 17 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Ortiz | 2018-2019 | .264 | 22 | 122 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortiz | 2028-2032 | .261 | 14 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Oscar Ortiz | 2033-2033 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Nate Osborn | 2034-2036 | .227 | 42 | 142 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Osburn | 2037-2041 | .207 | 12 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Osorio | 2036-2040 | .225 | 75 | 199 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Osorio | 2036-2037 | .216 | 7 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| John Ostman | 2032-2032 | .400 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Ostrander | 2022-2023 | .000 | 0 | 0 | 7 | 4 | 4 | 5.57 | 89 |
| Jose Osuna | 2029-2030 | .000 | 0 | 0 | 7 | 5 | 11 | 2.49 | 95 |
| Jason Ottem | 2020-2031 | .268 | 70 | 350 | 0 | 1 | 1 | 11.12 | 5 |
| Bryan Ottinger | 2035-2039 | .143 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Kent Ough | 2033-2039 | .234 | 39 | 111 | 0 | 0 | 0 | 0.00 | 0 |
| Pete Ourada | 2019-2023 | .252 | 28 | 174 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Outlaw | 2021-2027 | .238 | 6 | 32 | 0 | 0 | 0 | 4.91 | 5 |
| John Outman | 2033-2034 | .191 | 18 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Houston Overby | 2022-2025 | .298 | 11 | 112 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Overcash | 2031-2032 | .244 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Criostóir Owen | 2038-2041 | .217 | 10 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Sam Owen | 2021-2032 | .258 | 102 | 258 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Owen | 2026-2030 | .301 | 91 | 367 | 0 | 0 | 0 | 0.00 | 0 |
| Adan Owens | 2024-2027 | .245 | 27 | 101 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Owens | 2018-2022 | .000 | 0 | 0 | 13 | 10 | 3 | 4.41 | 193 |
| Rick Owens | 2034-2036 | .000 | 0 | 0 | 10 | 5 | 2 | 4.61 | 317 |
