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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Tim Siragusa# | 2.723 | 1952-1958 | |
| 2 | Maurice Duchemin# | 2.731 | 1952-1958 | |
| 3 | Kyle Cunningham# | 2.783 | 1953-1958 | |
| 4 | Ambrosius Schwartz# | 3.080 | 1952-1958 | |
| 5 | David Alvarado# | 3.167 | 1954-1957 | |
| 6 | Aaron Williams# | 3.195 | 1953-1958 | |
| 7 | Chris Walker# | 3.239 | 1952-1958 | |
| 8 | Jean Poisson# | 3.249 | 1952-1958 | |
| 9 | Ken Roberts# | 3.251 | 1952-1958 | |
| 10 | Aaron Maier# | 3.268 | 1952-1958 | |
| 10 | Jessy Kok# | 3.268 | 1952-1958 | |
| 12 | Jessie Blackwell# | 3.276 | 1954-1958 | |
| 13 | William Kelly# | 3.297 | 1952-1958 | |
| 14 | Brian Robb# | 3.330 | 1952-1958 | |
| 15 | Hirose Inouye# | 3.340 | 1956-1958 | |
| 16 | Griff Murphy# | 3.347 | 1952-1958 | |
| 17 | Stephen Anderson# | 3.377 | 1956-1958 | |
| 18 | Mounir Soulier# | 3.404 | 1952-1957 | |
| 19 | Ewan Moore# | 3.435 | 1952-1958 | |
| 20 | Raul Ropotan# | 3.454 | 1952-1957 | |
| 21 | Seon-jong Kim# | 3.464 | 1952-1958 | |
| 22 | Jim Meagher# | 3.470 | 1954-1958 | |
| 23 | Mike Butler | 3.479 | 1952-1957 | |
| 24 | Khalil Smith# | 3.504 | 1952-1957 | |
| 24 | Oscar Martel# | 3.504 | 1952-1958 | |
| 26 | Elliot Martin# | 3.518 | 1952-1958 | |
| 27 | Steve Ausmus# | 3.523 | 1956-1958 | |
| 28 | Will Brouwer# | 3.525 | 1952-1958 | |
| 28 | Sean White# | 3.525 | 1955-1958 | |
| 30 | Jim Wigginton# | 3.528 | 1952-1957 | |
| 31 | Eitan Löbel# | 3.533 | 1953-1958 | |
| 32 | Adam Scali# | 3.542 | 1953-1958 | |
| 33 | Chance Moder# | 3.603 | 1952-1954 | |
| 34 | Scott Bradburn | 3.610 | 1952-1953 | |
| 35 | Jorge Martinez# | 3.613 | 1952-1956 | |
| 36 | Eddie Johnson# | 3.653 | 1952-1958 | |
| 37 | Omar Cespedes# | 3.657 | 1952-1958 | |
| 38 | Theodor Brown# | 3.683 | 1953-1957 | |
| 39 | Bobby Stamper# | 3.691 | 1952-1958 | |
| 40 | Carl Lendon# | 3.702 | 1954-1958 | |
| 41 | Pippo Ammanati# | 3.739 | 1952-1958 | |
| 42 | Yvain Vecchio# | 3.811 | 1952-1958 | |
| 43 | Alexandre Lefevre# | 3.857 | 1952-1958 | |
| 44 | Juan Flores# | 3.875 | 1952-1958 | |
| 45 | Brandon Lanning# | 3.944 | 1953-1958 | |
| 46 | Parker Frost# | 4.041 | 1952-1958 | |
| 47 | Robert Holbert | 4.056 | 1952-1953 | |
| 48 | Camden Fenton# | 4.066 | 1952-1957 | |
| 49 | Josh Harmon# | 4.071 | 1952-1958 | |
| 50 | Fjodor Semchenko# | 4.097 | 1954-1958 | |
| 51 | Teruo Noda# | 4.124 | 1952-1958 | |
| 52 | Alexis Petito# | 4.166 | 1952-1958 | |
| 53 | Jim Harrold | 4.180 | 1952-1955 | |
| 54 | Danny Arellano# | 4.202 | 1952-1956 | |
| 55 | Joel Soucy# | 4.225 | 1957-1958 | |
| 56 | Raymond Finiguerra# | 4.242 | 1957-1958 | |
| 57 | Iiro Mikkola# | 4.244 | 1952-1958 | |
| 58 | Renaud Goffi# | 4.246 | 1952-1958 | |
| 59 | Hiromi Yoneda# | 4.286 | 1952-1958 | |
| 60 | Chris Ellis# | 4.293 | 1952-1958 | |
| 61 | Ceasario DeSanctis# | 4.312 | 1952-1957 | |
| 62 | Zee-loo Fan# | 4.327 | 1952-1958 | |
| 63 | Matt Heydt# | 4.330 | 1952-1958 | |
| 64 | John Hahn# | 4.467 | 1952-1958 | |
| 65 | Wei-qian Le# | 4.601 | 1952-1958 | |
| 66 | Biaiardo Arcangeli# | 4.836 | 1952-1958 | |
| 67 | Enea Paluzzi# | 4.955 | 1952-1958 | |
| 68 | Justin Hoover# | 5.194 | 1953-1958 |
