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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 | 2040-2040 | .000 | 0 | 0 | 2 | 0 | 0 | 2.45 | 11 |
| Tim O'Brian | 2033-2034 | .294 | 13 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| Rob O'Brien | 2042-2042 | .000 | 0 | 0 | 1 | 1 | 0 | 6.29 | 49 |
| Guaire O'Clavin | 2034-2034 | .115 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Emerson O'Drunen | 2033-2033 | .255 | 4 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Steve O'Fennaghty | 2035-2035 | .156 | 0 | 3 | 6 | 8 | 3 | 4.05 | 100 |
| Melvin O'Herlihy | 2032-2032 | .000 | 0 | 0 | 1 | 1 | 0 | 7.29 | 15 |
| Ray O'Morrisey | 2042-2042 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Wes O'Mulhill | 2033-2033 | .255 | 3 | 14 | 1 | 0 | 0 | 6.75 | 0 |
| Jim O'Neal | 2040-2040 | .217 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Lawrence O'Neal | 2033-2033 | .292 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Neil | 2032-2032 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Nick O'Quigley | 2039-2039 | .163 | 3 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Shane O'Toole | 2036-2036 | .000 | 0 | 0 | 0 | 2 | 9 | 2.61 | 21 |
| Ezequiel Oacia | 2033-2033 | .260 | 14 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Octávio Obezo | 2040-2040 | .320 | 4 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ocasio | 2035-2035 | .245 | 12 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Ocasio | 2032-2032 | .429 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Odilia | 2040-2041 | .326 | 0 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Gil Offredi | 2040-2040 | .303 | 1 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Torajiro Ogawa | 2035-2035 | .276 | 1 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Oglethorpe | 2041-2042 | .277 | 4 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Hiroshige Ohashi | 2037-2038 | .290 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Sakutaro Ohayashi | 2032-2032 | .000 | 0 | 0 | 2 | 13 | 0 | 6.70 | 86 |
| Carlos Oilvares | 2040-2040 | .000 | 0 | 0 | 13 | 5 | 0 | 3.12 | 148 |
| Hidekazu Okawa | 2033-2034 | .000 | 0 | 0 | 2 | 2 | 0 | 4.40 | 40 |
| Josuke Okumura | 2038-2038 | .000 | 0 | 0 | 1 | 3 | 0 | 3.04 | 27 |
| Juan Oleastro | 2037-2038 | .314 | 9 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Olivas | 2041-2041 | .293 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Doug Olsen | 2036-2036 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Marc Olsen | 2037-2037 | .000 | 0 | 0 | 0 | 3 | 4 | 3.15 | 10 |
| Félix Olvera | 2037-2038 | .280 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Jae-keol Om | 2042-2042 | .217 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jaake Ooyendijk | 2039-2039 | .000 | 0 | 0 | 1 | 0 | 0 | 2.25 | 13 |
| Falco Opsteegh | 2033-2033 | .286 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Ordinario | 2035-2035 | .000 | 0 | 0 | 1 | 0 | 0 | 1.35 | 2 |
| Freddy Ordóńez | 2042-2042 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Oreta | 2042-2042 | .271 | 1 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Louis Orioli | 2041-2041 | .000 | 0 | 0 | 2 | 2 | 0 | 4.50 | 12 |
| Anastasio Oríz | 2035-2038 | .234 | 21 | 96 | 0 | 0 | 0 | 0.00 | 0 |
| Gerald Orlebar | 2032-2032 | .000 | 0 | 0 | 1 | 3 | 9 | 4.84 | 36 |
| Sasha Orlovsky | 2033-2035 | .271 | 11 | 82 | 0 | 0 | 0 | 0.00 | 1 |
| Luis Ornelas | 2042-2042 | .000 | 0 | 0 | 3 | 5 | 6 | 3.72 | 36 |
| António Orozco | 2041-2042 | .284 | 6 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortega | 2039-2040 | .000 | 0 | 0 | 3 | 0 | 0 | 0.92 | 16 |
| José Ortega | 2032-2035 | .308 | 26 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Ánibal Ortíz | 2032-2032 | .000 | 0 | 0 | 5 | 3 | 5 | 2.47 | 85 |
| Augusto Ortíz | 2041-2042 | .270 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Bartolo Ortíz | 2038-2038 | .238 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortíz | 2037-2039 | .000 | 0 | 0 | 5 | 2 | 5 | 3.11 | 130 |
| Pedro Ortíz | 2032-2032 | .327 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Royce Ortíz | 2033-2033 | .000 | 0 | 0 | 0 | 3 | 0 | 6.75 | 8 |
| Víctor Ortíz | 2036-2036 | .264 | 3 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Orinosuke Oshiro | 2040-2040 | .000 | 0 | 0 | 3 | 7 | 0 | 4.48 | 81 |
| Roy Osmond | 2037-2037 | .263 | 1 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Bastien Oudin | 2038-2038 | .299 | 1 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Conrad Overdevest | 2039-2040 | .262 | 11 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| DeMarvion Overshown | 2033-2033 | .343 | 9 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Kieran Owens | 2036-2037 | .208 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
