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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Sal Mastroianni | 2.094 | 1907-1914 | |
| 2 | Ubaldo Mezzatesta | 2.125 | 1907-1914 | |
| 3 | Emir Halil | 2.182 | 1907-1914 | |
| 4 | Cesar Arfè | 2.540 | 1907-1913 | |
| 5 | Aymeric Arcimboldo | 2.759 | 1907-1914 | |
| 6 | Michal Havrda | 2.954 | 1907-1914 | |
| 7 | Raynard Weber | 3.132 | 1907-1914 | |
| 8 | Mathieu Arfè | 3.311 | 1907-1914 | |
| 9 | Dalimil Mares | 3.459 | 1907-1914 | |
| 10 | Ottavio Cantimori | 3.462 | 1907-1914 | |
| 11 | Dominik Forejt | 3.600 | 1907-1914 | |
| 12 | Pieroantonio Cardia | 3.661 | 1907-1914 | |
| 13 | Vavrik Spur | 3.906 | 1907-1914 | |
| 14 | Verdiano Loria | 4.210 | 1907-1914 | |
| 15 | Nimet Kemalettin | 4.219 | 1907-1914 | |
| 15 | Theodorich Martin | 4.219 | 1907-1914 | |
| 17 | Hubert Rohde | 4.765 | 1907-1914 | |
| 18 | Otmar Velikonja | 4.844 | 1907-1914 | |
| 19 | Sebald Zimmerman | 4.954 | 1907-1914 | |
| 20 | Webber Zimmer | 5.000 | 1907-1914 | |
| 21 | Matej Pahor | 5.253 | 1907-1914 | |
| 22 | Alba Florido | 5.484 | 1907-1914 | |
| 23 | Rudi Alexander | 5.637 | 1907-1914 |
