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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 |
|---|---|---|---|---|---|---|---|---|---|
| Alex O' Donell | 1978-1981 | .270 | 16 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Fred O'Connell | 1972-1981 | .000 | 0 | 0 | 36 | 52 | 2 | 4.13 | 392 |
| Jimmy O'Hara | 1973-1981 | .000 | 0 | 0 | 6 | 5 | 0 | 4.47 | 51 |
| Matt O'Keefe | 1974-1977 | .000 | 0 | 0 | 3 | 2 | 1 | 5.14 | 40 |
| Tyler Oatis | 1979-1980 | .200 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Ochoa | 1973-1980 | .194 | 5 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Hugo Ochoa | 1975-1980 | .000 | 0 | 0 | 7 | 4 | 3 | 2.40 | 43 |
| Ricky Oestreich | 1972-1975 | .000 | 0 | 0 | 1 | 0 | 0 | 8.47 | 6 |
| Isoruko Ogawa | 1974-1974 | .000 | 0 | 0 | 0 | 0 | 0 | 16.20 | 0 |
| Atsumi Okinaka | 1976-1979 | .000 | 0 | 0 | 9 | 11 | 0 | 2.76 | 71 |
| Reilly Oldford | 1972-1972 | .189 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Olesen | 1972-1981 | .000 | 0 | 0 | 130 | 94 | 1 | 3.38 | 1250 |
| David Olguin | 1979-1981 | .244 | 36 | 140 | 0 | 0 | 0 | 0.00 | 0 |
| Casey Olive | 1972-1976 | .177 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jordan Oliver | 1978-1978 | .000 | 0 | 0 | 1 | 2 | 0 | 5.59 | 20 |
| Eddie Olmos | 1972-1978 | .000 | 0 | 0 | 32 | 41 | 0 | 4.14 | 327 |
| Manol Olmpio | 1972-1972 | .203 | 2 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Olson | 1972-1977 | .000 | 0 | 0 | 31 | 45 | 0 | 3.94 | 459 |
| Tesfaye Olubayo | 1972-1979 | .000 | 0 | 0 | 20 | 21 | 0 | 4.30 | 144 |
| Hiroki Ono | 1977-1981 | .000 | 0 | 0 | 50 | 49 | 0 | 3.60 | 572 |
| Izzy Ontiveros | 1979-1979 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Orea | 1977-1977 | .139 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Rene Oregon | 1972-1981 | .000 | 0 | 0 | 79 | 70 | 0 | 3.71 | 844 |
| Sergio Ornelas | 1977-1981 | .252 | 2 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Orozco | 1976-1980 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Orozco | 1980-1981 | .280 | 24 | 114 | 0 | 0 | 0 | 0.00 | 0 |
| Ismael Orta | 1972-1975 | .111 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Andres Ortega | 1979-1979 | .000 | 0 | 0 | 0 | 1 | 0 | 5.06 | 5 |
| Arturo Ortega | 1973-1973 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby Ortega | 1974-1975 | .000 | 0 | 0 | 0 | 0 | 0 | 8.31 | 4 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Emilio Ortega | 1973-1981 | .000 | 0 | 0 | 17 | 7 | 8 | 3.49 | 128 |
| Ernesto Ortega | 1981-1981 | .312 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Leonardo Ortega | 1974-1980 | .190 | 8 | 137 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Ortiz | 1981-1981 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| David Ortiz | 1973-1973 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Javy Ortiz | 1978-1979 | .167 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortiz | 1980-1981 | .297 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortiz | 1977-1981 | .500 | 1 | 1 | 5 | 4 | 4 | 5.26 | 89 |
| Julio Ortiz | 1976-1976 | .000 | 0 | 0 | 0 | 1 | 0 | 12.60 | 3 |
| Ricky Ortiz | 1980-1981 | .229 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Salvatorio Ortiz | 1972-1973 | .242 | 20 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Tim Osborne | 1972-1974 | .000 | 0 | 0 | 0 | 0 | 0 | 3.69 | 32 |
| Shigeo Oshima | 1981-1981 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Osorio | 1979-1981 | .318 | 4 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Osuna | 1972-1979 | .232 | 73 | 292 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Otero | 1981-1981 | .200 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Yic Ou-yang | 1978-1979 | .077 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Oubre | 1972-1981 | .000 | 0 | 0 | 135 | 97 | 0 | 3.02 | 1607 |
| Kuranosuke Ouchi | 1972-1977 | .000 | 0 | 0 | 24 | 26 | 0 | 3.81 | 303 |
| Mike Overmiller | 1972-1980 | .000 | 0 | 0 | 20 | 19 | 37 | 2.80 | 171 |
| Tyler Ozmun | 1972-1979 | .231 | 42 | 220 | 0 | 0 | 0 | 0.00 | 0 |
