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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | WHIP | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Cesar Arfè | 0.99 | 1907-1913 | |
| 2 | Raynard Weber | 1.02 | 1907-1914 | |
| 3 | Ubaldo Mezzatesta | 1.03 | 1907-1914 | |
| 4 | Sal Mastroianni# | 1.05 | 1907-1914 | |
| 5 | Mathieu Arfè | 1.13 | 1907-1914 | |
| 6 | Pieroantonio Cardia# | 1.14 | 1907-1914 | |
| 7 | Emir Halil | 1.15 | 1907-1914 | |
| 8 | Dominik Forejt | 1.16 | 1907-1914 | |
| 9 | Michal Havrda | 1.18 | 1907-1914 | |
| 10 | Aymeric Arcimboldo | 1.23 | 1907-1914 | |
| 11 | Vavrik Spur | 1.25 | 1907-1914 | |
| 12 | Hubert Rohde | 1.26 | 1907-1914 | |
| 13 | Ottavio Cantimori | 1.31 | 1907-1914 | |
| 13 | Dalimil Mares | 1.31 | 1907-1914 | |
| 15 | Alba Florido | 1.34 | 1907-1914 | |
| 16 | Otmar Velikonja | 1.35 | 1907-1914 | |
| 16 | Rudi Alexander# | 1.35 | 1907-1914 | |
| 16 | Verdiano Loria | 1.35 | 1907-1914 | |
| 19 | Nimet Kemalettin | 1.38 | 1907-1914 | |
| 20 | Theodorich Martin | 1.41 | 1907-1914 | |
| 21 | Matej Pahor | 1.42 | 1907-1914 | |
| 22 | Sebald Zimmerman | 1.51 | 1907-1914 | |
| 23 | Webber Zimmer | 1.56 | 1907-1914 |
