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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 |
|---|---|---|---|---|---|---|---|---|---|
| Sung-tae O | 2038-2039 | .000 | 0 | 0 | 5 | 9 | 1 | 4.51 | 98 |
| Bob O'Bryan | 2042-2042 | .000 | 0 | 0 | 7 | 4 | 0 | 2.92 | 128 |
| Alex O'Dell | 2035-2036 | .000 | 0 | 0 | 3 | 4 | 1 | 2.48 | 80 |
| Michael O'Donnell | 2041-2041 | .000 | 0 | 0 | 6 | 1 | 2 | 3.28 | 48 |
| Emerson O'Drunen | 2034-2035 | .290 | 3 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Melvin O'Herlihy | 2032-2032 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Bobby O'Kennedy | 2037-2039 | .251 | 20 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Artie O'Neal | 2039-2040 | .000 | 0 | 0 | 10 | 3 | 3 | 2.02 | 159 |
| Lawrence O'Neal | 2034-2036 | .267 | 17 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Neil | 2038-2038 | .000 | 0 | 0 | 2 | 1 | 0 | 0.22 | 38 |
| Mike O'Neill | 2032-2035 | .275 | 6 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Dana O'Quinlevan | 2039-2040 | .243 | 8 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny O'Quinn | 2032-2032 | .378 | 1 | 5 | 7 | 5 | 0 | 3.99 | 87 |
| Eric O'Slattery | 2038-2041 | .000 | 0 | 0 | 5 | 9 | 16 | 3.77 | 102 |
| Joe O'Toole | 2036-2036 | .300 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Ezequiel Oacia | 2032-2032 | .278 | 11 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| José Ocasio | 2034-2036 | .318 | 15 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ochoa | 2032-2032 | .000 | 0 | 0 | 3 | 4 | 12 | 2.35 | 50 |
| Torajiro Ogawa | 2034-2034 | .263 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Oglethorpe | 2040-2040 | .288 | 3 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Koryusai Ohayashi | 2039-2039 | .382 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Nobuhiko Ohayashi | 2037-2038 | .295 | 6 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Romochka Oistrah | 2038-2040 | .000 | 0 | 0 | 2 | 0 | 3 | 1.66 | 47 |
| Hidekazu Okawa | 2032-2032 | .000 | 0 | 0 | 6 | 5 | 0 | 4.94 | 57 |
| Gavin Okel | 2039-2042 | .278 | 9 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Oleastro | 2036-2036 | .243 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Richello Oliva | 2032-2033 | .353 | 15 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Olivas | 2042-2042 | .261 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| David Oliver | 2040-2040 | .000 | 0 | 0 | 0 | 0 | 0 | 7.45 | 6 |
| Corey Ollerton | 2034-2034 | .257 | 8 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Dan Olson | 2036-2036 | .219 | 3 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Félix Olvera | 2039-2039 | .290 | 3 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Abdul-Salam Omar | 2032-2034 | .000 | 0 | 0 | 9 | 5 | 2 | 2.67 | 170 |
| Yoritoki Onodera | 2036-2037 | .000 | 0 | 0 | 3 | 4 | 5 | 3.20 | 65 |
| Steve Oort | 2041-2042 | .000 | 0 | 0 | 2 | 2 | 2 | 4.57 | 81 |
| Gijsbert Oostenbroek | 2033-2034 | .000 | 0 | 0 | 2 | 0 | 3 | 3.12 | 40 |
| Falco Opsteegh | 2034-2035 | .357 | 7 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Dylan Oram | 2034-2035 | .266 | 7 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Gerald Orlebar | 2033-2034 | .000 | 0 | 0 | 17 | 18 | 1 | 3.94 | 264 |
| Sasha Orlovsky | 2036-2036 | .283 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| António Ortega | 2032-2032 | .304 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ortega | 2034-2036 | .273 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2038-2038 | .000 | 0 | 0 | 5 | 2 | 7 | 2.70 | 73 |
| Ánibal Ortíz | 2033-2033 | .000 | 0 | 0 | 2 | 0 | 0 | 2.43 | 56 |
| Aurelio Ortíz | 2032-2035 | .000 | 0 | 0 | 20 | 15 | 14 | 4.00 | 359 |
| Eduardo Ortíz | 2038-2038 | .167 | 0 | 0 | 0 | 1 | 0 | 10.80 | 0 |
| Félix Ortíz | 2038-2039 | .000 | 0 | 0 | 9 | 12 | 7 | 4.08 | 164 |
| Francisco Ortíz | 2034-2036 | .260 | 3 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ortíz | 2032-2033 | .000 | 0 | 0 | 4 | 2 | 0 | 3.86 | 72 |
| Gilberto Ortíz | 2035-2035 | .194 | 0 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortíz | 2036-2036 | .000 | 0 | 0 | 3 | 1 | 0 | 5.20 | 48 |
| Lorenzo Ortíz | 2034-2036 | .311 | 6 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortíz | 2042-2042 | .279 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ortíz | 2032-2033 | .274 | 6 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Royce Ortíz | 2034-2034 | .000 | 0 | 0 | 3 | 0 | 0 | 2.33 | 59 |
| Francis Osborne | 2032-2032 | .375 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshifumi Oshima | 2041-2042 | .000 | 0 | 0 | 8 | 7 | 0 | 3.15 | 147 |
| Orinosuke Oshiro | 2039-2039 | .000 | 0 | 0 | 2 | 0 | 0 | 5.06 | 11 |
| Bungay Osiman | 2038-2038 | .000 | 0 | 0 | 6 | 5 | 1 | 2.78 | 62 |
| Pim Oskamp | 2042-2042 | .160 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Toshikasu Otani | 2033-2033 | .214 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Habib Othman | 2039-2039 | .305 | 3 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Ralph Owens | 2033-2035 | .000 | 0 | 0 | 7 | 10 | 1 | 3.91 | 170 |
| Tim Owens | 2036-2036 | .000 | 0 | 0 | 0 | 3 | 0 | 4.04 | 23 |
| Jorge Oyas | 2032-2032 | .174 | 0 | 2 | 10 | 7 | 0 | 4.18 | 108 |
| Kyuichi Ozawa | 2041-2041 | .000 | 0 | 0 | 3 | 2 | 0 | 2.16 | 60 |
