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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 |
|---|---|---|---|---|---|---|---|---|---|
| Kerwin O'Brien | 1922-1925 | .301 | 2 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen O'Connell | 1921-1925 | .317 | 1 | 369 | 0 | 0 | 0 | 0.00 | 0 |
| Djoka Obradovic | 1922-1922 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dzevat Obradovic | 1921-1925 | .316 | 1 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Alessandro Occhena | 1925-1925 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Egiodeo Odescalchi | 1921-1925 | .273 | 0 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Milan Ogrijenovic | 1921-1925 | .167 | 0 | 4 | 23 | 30 | 50 | 5.03 | 31 |
| Volker Oliver | 1921-1924 | .303 | 0 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Dylan Olivier | 1924-1924 | .208 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Florent Ollier | 1926-1926 | .381 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Bernard Ollivier | 1926-1926 | .200 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Radovan Omeragic | 1926-1926 | .222 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Telek Opoka | 1921-1924 | .125 | 0 | 0 | 9 | 3 | 8 | 3.39 | 11 |
| Rene Oravec | 1921-1925 | .274 | 0 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Casimir Orczyk | 1921-1923 | .000 | 0 | 0 | 1 | 1 | 1 | 1.40 | 0 |
| Danny Ortiz | 1921-1925 | .276 | 1 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Edmund Osinski | 1921-1925 | .315 | 0 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Borenko Ostrozinska | 1921-1923 | .226 | 0 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Rudolf Otten | 1924-1925 | .311 | 2 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Benjamin Ottinger | 1921-1922 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mircea Otvos | 1921-1925 | .333 | 0 | 2 | 17 | 11 | 23 | 3.07 | 27 |
