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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Callum MacLean# | 3.273 | 1954-1955 | |
| 2 | Logan Smith# | 3.311 | 1955-1959 | |
| 3 | Jean-Louis Monnier# | 3.512 | 1954-1957 | |
| 4 | Justin Lawrence# | 3.784 | 1952-1959 | |
| 5 | Lakew Odoyo# | 3.844 | 1953-1957 | |
| 6 | Chris Fischer | 3.881 | 1953-1955 | |
| 7 | Larry Lewis# | 4.013 | 1957-1959 | |
| 8 | Roger Stratton# | 4.084 | 1953-1958 | |
| 8 | Nick Chasteen# | 4.084 | 1955-1959 | |
| 10 | Helmuth Fries# | 4.133 | 1955-1957 | |
| 11 | Kazuto Shimokawa# | 4.139 | 1954-1958 | |
| 12 | Romel Quico | 4.158 | 1952-1957 | |
| 13 | Baldassario Scuderi# | 4.165 | 1952-1956 | |
| 14 | Shanahan Gales# | 4.231 | 1955-1958 | |
| 15 | Mike Mark# | 4.270 | 1953-1959 | |
| 16 | Ricky Camacho# | 4.327 | 1954-1957 | |
| 17 | Chiaki Nakanishi# | 4.340 | 1952-1958 | |
| 18 | Mark Lapointe# | 4.347 | 1952-1957 | |
| 19 | Daryl Kelsey# | 4.350 | 1953-1955 | |
| 20 | Justin Frost# | 4.370 | 1957-1959 | |
| 21 | Zach O'Flaherty# | 4.401 | 1952-1958 | |
| 22 | Fremont Ruff# | 4.415 | 1957-1959 | |
| 23 | Keverne Griffin# | 4.438 | 1952-1956 | |
| 24 | Jonathan Willis# | 4.514 | 1952-1958 | |
| 25 | Jose Santos | 4.527 | 1952-1957 | |
| 26 | Dwight Paulsen# | 4.550 | 1952-1957 | |
| 27 | Mitch Kircher# | 4.557 | 1953-1958 | |
| 28 | Raul Alejandro | 4.597 | 1953-1957 | |
| 29 | Jim Sacco | 4.601 | 1952-1958 | |
| 30 | Ryan Wilson# | 4.652 | 1955-1957 | |
| 31 | Takehiko Okuno# | 4.653 | 1953-1958 | |
| 32 | Dave Walker | 4.675 | 1952-1955 | |
| 33 | Justin Corey# | 4.725 | 1955-1956 | |
| 34 | Francis Griffiths# | 4.770 | 1952-1957 | |
| 35 | Willie Moreno# | 4.782 | 1952-1958 | |
| 36 | Pyry Uusikartano# | 4.802 | 1952-1959 | |
| 37 | Enrique Garcia | 4.811 | 1953-1957 | |
| 38 | Bas Petersen# | 4.813 | 1954-1959 | |
| 39 | Greg Strate# | 4.817 | 1953-1958 | |
| 40 | Tom Ledoux# | 4.865 | 1952-1954 | |
| 41 | Toni Pellonpaa# | 4.887 | 1952-1959 | |
| 42 | Aaron Brock | 4.930 | 1954-1956 | |
| 43 | Roberto Bianchetti | 4.931 | 1952-1955 | |
| 44 | Kyle Haas# | 4.971 | 1955-1956 | |
| 45 | Danny Bennett# | 5.004 | 1952-1958 | |
| 46 | Rudjer Srebov | 5.092 | 1952-1956 | |
| 47 | Mike Stark# | 5.135 | 1954-1956 | |
| 48 | Alberto Loredo# | 5.143 | 1952-1958 | |
| 49 | Anders Jensen | 5.148 | 1952-1955 | |
| 50 | Bobby Dowell | 5.149 | 1955-1958 | |
| 51 | Tomofumi Sugimoto | 5.176 | 1952-1953 | |
| 52 | Robby Dedrick# | 5.284 | 1954-1957 | |
| 53 | Patrick Smit# | 5.345 | 1954-1957 | |
| 54 | Ruben Myers# | 5.357 | 1955-1959 | |
| 55 | Brian Amspacher# | 5.393 | 1955-1959 | |
| 56 | Kevin Herrington# | 5.400 | 1955-1959 | |
| 57 | Jimmy Bucey# | 5.505 | 1956-1959 | |
| 58 | Ben Barnes | 5.536 | 1956-1957 | |
| 59 | Matt McGovern# | 5.538 | 1955-1957 | |
| 60 | Dermott Mistry | 5.556 | 1956-1958 | |
| 61 | Anatolio Florioli# | 5.568 | 1955-1957 | |
| 62 | Ivan Martinez | 5.581 | 1952-1953 | |
| 63 | Huai-yi Li# | 5.605 | 1955-1957 | |
| 64 | Endres Hiedler# | 5.638 | 1954-1958 | |
| 65 | Leandro Boccherini | 5.652 | 1955-1958 | |
| 66 | Louie King | 5.749 | 1952-1953 | |
| 67 | Garrett Holcomb | 5.933 | 1952-1953 | |
| 68 | Bernward Mayer | 5.938 | 1952-1955 | |
| 69 | Aaron Stone# | 6.004 | 1952-1957 | |
| 70 | Brian Triska | 6.028 | 1952-1953 | |
| 71 | Dietmar Schmidt | 6.181 | 1952-1953 | |
| 72 | Alexander Baune | 6.186 | 1952-1954 | |
| 73 | Jose Rodriguez# | 6.203 | 1954-1956 | |
| 74 | Preki Savicevic# | 6.234 | 1955-1957 | |
| 75 | J.J. Courson# | 6.241 | 1957-1959 | |
| 76 | Francisco Tumax | 6.380 | 1952-1953 | |
| 77 | Shane Smith | 6.393 | 1955-1958 | |
| 78 | David Gonzalez | 6.740 | 1952-1954 | |
| 79 | Josh Fightmaster# | 6.750 | 1957-1959 | |
| 80 | Liam Bethell# | 7.136 | 1957-1958 | |
| 80 | Jacob Brown | 7.136 | 1952-1953 | |
| 82 | Juan Tamez | 7.174 | 1956-1958 |
