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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Jason Nelson# | 0.568 | 1952-1955 | |
| 2 | Jose Villasenor# | 1.390 | 1952-1958 | |
| 3 | Luis Matos# | 2.172 | 1952-1958 | |
| 4 | Fjodor Semchenko# | 2.500 | 1955-1957 | |
| 5 | Tim Siragusa# | 2.609 | 1952-1957 | |
| 6 | Camden Fenton# | 2.672 | 1952-1957 | |
| 7 | Khalil Smith# | 2.683 | 1952-1957 | |
| 8 | Sean White# | 2.685 | 1955-1957 | |
| 9 | Scott Bradburn | 2.757 | 1952-1953 | |
| 10 | Corey Workman | 2.815 | 1952-1953 | |
| 11 | Jorge Rivera# | 2.842 | 1956-1958 | |
| 12 | Silvio Schaminée# | 2.899 | 1953-1957 | |
| 13 | Jesus Gutierrez# | 2.935 | 1958-1958 | |
| 14 | Will Brouwer# | 3.048 | 1953-1957 | |
| 15 | Danny Arellano# | 3.059 | 1952-1958 | |
| 16 | Chris Ellis# | 3.100 | 1952-1957 | |
| 17 | Steve Schlachter | 3.124 | 1952-1952 | |
| 18 | Alexandre Lefevre# | 3.141 | 1952-1957 | |
| 19 | Mario Martinez | 3.176 | 1952-1954 | |
| 20 | Juan Flores# | 3.195 | 1952-1957 | |
| 21 | Eitan Löbel# | 3.265 | 1953-1957 | |
| 22 | Chris Walker# | 3.283 | 1953-1957 | |
| 23 | Ennio Maffei# | 3.411 | 1952-1957 | |
| 24 | Ewan Moore# | 3.440 | 1952-1957 | |
| 25 | Josh Harmon# | 3.448 | 1953-1957 | |
| 26 | Brandon Lanning# | 3.472 | 1953-1957 | |
| 27 | Hirose Inouye# | 3.600 | 1956-1957 | |
| 27 | Ken Moss# | 3.600 | 1952-1954 | |
| 29 | Stephen Anderson# | 3.611 | 1956-1957 | |
| 30 | Justin Hoover# | 3.620 | 1953-1956 | |
| 31 | Theodor Brown# | 3.672 | 1954-1957 | |
| 32 | Iiro Mikkola# | 3.691 | 1953-1957 | |
| 33 | Aaron Maier# | 3.706 | 1952-1957 | |
| 34 | Oscar Martel# | 3.709 | 1952-1957 | |
| 35 | Justin Corey# | 3.755 | 1952-1957 | |
| 36 | Corey Cavazos | 3.818 | 1952-1954 | |
| 37 | Adam Scali# | 3.822 | 1953-1957 | |
| 38 | Omar Cespedes# | 3.857 | 1952-1956 | |
| 39 | Ryokan Suzuki# | 3.881 | 1953-1957 | |
| 40 | Mounir Soulier# | 3.892 | 1952-1957 | |
| 41 | Maurice Duchemin# | 3.916 | 1952-1957 | |
| 42 | Griff Murphy# | 3.939 | 1952-1957 | |
| 43 | Matt Heydt# | 3.943 | 1953-1957 | |
| 44 | Parker Frost# | 3.971 | 1952-1957 | |
| 45 | Eddie Johnson# | 4.021 | 1952-1957 | |
| 46 | Jim Harrold | 4.077 | 1952-1955 | |
| 47 | Raul Ropotan# | 4.159 | 1952-1957 | |
| 48 | Dylan Murray# | 4.171 | 1952-1957 | |
| 49 | Seon-jong Kim# | 4.202 | 1952-1957 | |
| 50 | Jim Upham# | 4.211 | 1952-1954 | |
| 51 | Enea Paluzzi# | 4.240 | 1952-1957 | |
| 52 | Alexis Petito# | 4.252 | 1952-1957 | |
| 53 | Wei-qian Le# | 4.283 | 1952-1956 | |
| 54 | Chance Moder# | 4.395 | 1952-1954 | |
| 55 | Brian Robb# | 4.425 | 1952-1957 | |
| 56 | Jim Meagher# | 4.426 | 1955-1957 | |
| 57 | Teruo Noda# | 4.489 | 1952-1957 | |
| 58 | Mike Butler | 4.500 | 1952-1957 | |
| 58 | Tom Ledoux# | 4.500 | 1952-1957 | |
| 58 | Raul Valdes# | 4.500 | 1952-1953 | |
| 61 | John Hahn# | 4.526 | 1954-1957 | |
| 62 | Ceasario DeSanctis# | 4.538 | 1952-1957 | |
| 63 | Renaud Goffi# | 4.571 | 1952-1957 | |
| 64 | Anatolio Florioli# | 4.585 | 1952-1954 | |
| 65 | William Kelly# | 4.587 | 1952-1957 | |
| 66 | Jorge Martinez# | 4.593 | 1952-1956 | |
| 67 | Ken Roberts# | 4.611 | 1952-1957 | |
| 68 | Remon Bevelander# | 4.636 | 1952-1958 | |
| 69 | Aaron Williams# | 4.689 | 1953-1957 | |
| 70 | David Alvarado# | 4.696 | 1955-1956 | |
| 71 | Jessy Kok# | 4.846 | 1952-1957 | |
| 72 | John Gladue# | 4.852 | 1952-1956 | |
| 73 | Elliot Martin# | 4.878 | 1953-1956 | |
| 74 | Tim McCoy# | 4.976 | 1952-1954 | |
| 75 | Michele Mascolo | 5.108 | 1952-1952 | |
| 76 | Robert Holbert | 5.131 | 1952-1954 | |
| 77 | Juan Rodriguez# | 5.400 | 1952-1956 | |
| 78 | Norm Johnson# | 5.452 | 1952-1953 | |
| 79 | Jose Garza# | 5.571 | 1958-1958 | |
| 80 | Hiromi Yoneda# | 5.625 | 1952-1957 | |
| 81 | Edwin Sanchez# | 5.651 | 1952-1955 | |
| 82 | Pippo Ammanati# | 5.682 | 1952-1957 | |
| 83 | Bobby Stamper# | 5.723 | 1952-1957 | |
| 84 | Lorenzo Hernandez# | 5.727 | 1958-1958 | |
| 85 | Carl Lendon# | 5.855 | 1955-1956 | |
| 86 | Yvain Vecchio# | 6.080 | 1952-1957 | |
| 87 | Zee-loo Fan# | 6.231 | 1952-1957 | |
| 88 | Biaiardo Arcangeli# | 6.261 | 1952-1957 | |
| 89 | Cédric Piot | 6.480 | 1952-1952 | |
| 90 | Jim Wigginton# | 7.065 | 1952-1957 | |
| 91 | Juan Moreno | 7.113 | 1952-1955 | |
| 92 | Jean Poisson# | 7.225 | 1952-1957 | |
| 93 | Ambrosius Schwartz# | 7.364 | 1952-1957 | |
| 94 | Matt Roberts# | 7.634 | 1953-1954 | |
| 95 | Remi Labraccio# | 7.896 | 1952-1956 |
