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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Justin Frost# | 2.126 | 1954-1954 | |
| 2 | Sean White# | 2.163 | 1952-1952 | |
| 3 | Gil Saylor# | 2.285 | 1952-1952 | |
| 4 | Loan Courtois# | 2.598 | 1952-1954 | |
| 5 | Tage Hamburger | 2.639 | 1952-1952 | |
| 6 | Carlos Rivera# | 2.659 | 1955-1956 | |
| 7 | Justin Booth# | 2.663 | 1953-1956 | |
| 8 | Logan Smith# | 2.832 | 1953-1954 | |
| 9 | Jesse Applebaum# | 2.847 | 1953-1954 | |
| 10 | Anthony Fennell# | 2.891 | 1953-1953 | |
| 11 | Pedro Gelpi# | 2.909 | 1952-1954 | |
| 11 | Ron Peterson | 2.909 | 1952-1954 | |
| 13 | Jerry Kirkpatrick | 2.913 | 1952-1953 | |
| 14 | Franz Schichegger# | 2.944 | 1952-1954 | |
| 15 | Quentin Ritchie# | 2.945 | 1952-1953 | |
| 16 | Kyle Haas# | 2.993 | 1952-1952 | |
| 17 | Ian Fox# | 3.015 | 1956-1958 | |
| 18 | Roland Knight# | 3.023 | 1952-1953 | |
| 19 | Ryan Cashman# | 3.024 | 1957-1958 | |
| 20 | Rich Donnelly# | 3.072 | 1952-1953 | |
| 21 | Joe Rogers# | 3.081 | 1954-1955 | |
| 22 | Corey DeMoss# | 3.302 | 1952-1953 | |
| 23 | Alex Hernandez# | 3.320 | 1952-1954 | |
| 24 | Huai-yi Li# | 3.352 | 1952-1952 | |
| 25 | John Ela# | 3.405 | 1952-1954 | |
| 25 | Adelbert Olinger# | 3.405 | 1952-1954 | |
| 27 | Adam Standley# | 3.444 | 1953-1954 | |
| 28 | Juan Salinas# | 3.481 | 1952-1955 | |
| 29 | Xavier Winkler# | 3.488 | 1952-1954 | |
| 30 | Sergio Huerta# | 3.500 | 1956-1958 | |
| 31 | Juan Tamez | 3.522 | 1952-1954 | |
| 32 | Jae-ik Kim | 3.544 | 1953-1954 | |
| 33 | Hideki Masuda | 3.555 | 1953-1956 | |
| 34 | Kelvin Campbell# | 3.557 | 1952-1953 | |
| 35 | Jose Diaz | 3.558 | 1954-1954 | |
| 36 | Magnus Nielsen# | 3.566 | 1957-1958 | |
| 37 | Hyun-woo Park# | 3.594 | 1952-1954 | |
| 38 | Preki Mijatovic# | 3.613 | 1952-1953 | |
| 39 | Dusan Vasic# | 3.617 | 1952-1955 | |
| 40 | Joe Bingley | 3.639 | 1953-1953 | |
| 41 | Jeigif Ovsepyan# | 3.647 | 1952-1954 | |
| 42 | Mario Ayala# | 3.672 | 1955-1958 | |
| 43 | Ricardo Rodriguez# | 3.682 | 1954-1955 | |
| 44 | Stephen Ferry# | 3.684 | 1956-1958 | |
| 45 | Unto Honka# | 3.695 | 1952-1953 | |
| 46 | Eric Graig# | 3.702 | 1952-1954 | |
| 46 | Dusty Kuhl | 3.702 | 1952-1955 | |
| 48 | Bill Stong | 3.704 | 1953-1955 | |
| 49 | Ricky Figueroa# | 3.726 | 1953-1955 | |
| 50 | Ryan Ward# | 3.857 | 1952-1954 | |
| 51 | Edwin Montes# | 3.995 | 1955-1958 | |
| 52 | Gottfried Mentzer | 4.072 | 1952-1954 | |
| 53 | Eppe Stéphan | 4.084 | 1952-1955 | |
| 54 | Dietrich Wagner# | 4.106 | 1956-1958 | |
| 55 | Yaseen Fudail# | 4.119 | 1952-1954 | |
| 56 | Aaron Combs | 4.159 | 1952-1952 | |
| 57 | Tony Chavez# | 4.226 | 1952-1953 | |
| 58 | Ernesto Saldivar | 4.294 | 1952-1953 | |
| 59 | John Abdon | 4.416 | 1953-1954 | |
| 60 | Steve Baggett | 4.479 | 1952-1954 | |
| 61 | Bas Petersen# | 4.546 | 1952-1952 | |
| 62 | Wilber Williams# | 4.570 | 1955-1958 | |
| 63 | Justin Stovall | 4.593 | 1952-1954 | |
| 64 | Tim Logan | 4.705 | 1952-1954 | |
| 65 | Jimmy Bucey# | 4.765 | 1953-1954 | |
| 66 | Juan Rodriguez# | 4.768 | 1952-1955 | |
| 67 | Brad Snook# | 4.788 | 1952-1954 | |
| 68 | Sébastien Chauveau | 4.792 | 1952-1953 | |
| 69 | Brian Gregg | 4.950 | 1952-1953 | |
| 70 | Brad Pease | 5.457 | 1955-1958 | |
| 71 | Ben Barnes | 5.567 | 1952-1954 | |
| 72 | David Profanter | 5.828 | 1952-1954 |
