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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Career Leaderboard |
|---|---|---|---|---|
| 1 | Sigfrid Ebert | 0.667 | 1907 | |
| 2 | Dalimil Mares | 1.459 | 1910 | |
| 3 | Michal Havrda | 1.500 | 1911 | |
| 4 | Cesar Arfè | 1.558 | 1910 | |
| 5 | Raynard Weber | 1.588 | 1913 | |
| 6 | Michal Havrda | 1.604 | 1912 | |
| 7 | Ubaldo Mezzatesta | 1.820 | 1910 | |
| 8 | Aymeric Arcimboldo | 2.000 | 1907 | |
| 9 | Sal Mastroianni# | 2.015 | 1907 | |
| 10 | Manfried Diffenderffer | 2.038 | 1910 | |
| 11 | Matej Pahor | 2.118 | 1912 | |
| 12 | Emir Halil | 2.182 | 1907 | |
| 13 | Sal Mastroianni# | 2.189 | 1911 | |
| 14 | Ubaldo Mezzatesta | 2.231 | 1912 | |
| 15 | Raynard Weber | 2.423 | 1911 | |
| 15 | Michal Havrda | 2.423 | 1910 | |
| 17 | Ottavio Cantimori | 2.455 | 1907 | |
| 17 | Dalimil Mares | 2.455 | 1912 | |
| 19 | Dalimil Mares | 2.547 | 1909 | |
| 20 | Rudi Alexander# | 2.613 | 1913 | |
| 21 | Webber Zimmer | 2.647 | 1912 | |
| 22 | Michal Havrda | 2.805 | 1909 | |
| 23 | Pieroantonio Cardia# | 3.000 | 1909 | |
| 23 | Dominik Forejt | 3.000 | 1910 | |
| 23 | Cesar Arfè | 3.000 | 1912 | |
| 26 | Mathieu Arfè | 3.076 | 1909 | |
| 27 | Verdiano Loria | 3.086 | 1912 | |
| 28 | Nicolas Pedersen | 3.115 | 1907 | |
| 29 | Vavrik Spur | 3.176 | 1912 | |
| 30 | Cesar Arfè | 3.240 | 1908 | |
| 31 | Theodorich Martin | 3.333 | 1911 | |
| 32 | Dominik Forejt | 3.500 | 1911 | |
| 33 | Dominik Forejt | 3.808 | 1908 | |
| 34 | Aymeric Arcimboldo | 3.857 | 1911 | |
| 35 | Pedro Cárdenas# | 3.913 | 1913 | |
| 36 | Raynard Weber | 4.075 | 1912 | |
| 37 | Matej Pahor | 4.175 | 1913 | |
| 38 | Otmar Velikonja | 4.219 | 1913 | |
| 39 | Nimet Kemalettin | 4.250 | 1913 | |
| 40 | Michal Havrda | 4.413 | 1908 | |
| 41 | Sebald Zimmerman | 4.433 | 1911 | |
| 42 | Ottavio Cantimori | 4.500 | 1911 | |
| 43 | Dominik Forejt | 4.558 | 1909 | |
| 44 | Hubert Rohde | 4.933 | 1913 | |
| 45 | Otmar Velikonja | 5.178 | 1908 | |
| 46 | Verdiano Loria | 5.260 | 1910 | |
| 47 | Alba Florido | 6.000 | 1909 | |
| 48 | Matej Pahor | 6.061 | 1907 | |
| 49 | Vittorio Gambachini# | 6.465 | 1908 | |
| 50 | Webber Zimmer | 7.163 | 1913 |
