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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Postseason Leaderboard |
|---|---|---|---|---|
| 1 | Reginald Dyer* | 0.890 | 2016-2031 | |
| 2 | José Vargas | 1.019 | 2036-2049 | |
| 3 | Ernesto Garza | 1.800 | 2044-2049 | |
| 4 | Robert Collard | 2.152 | 2030-2046 | |
| 5 | Ricardo Tobías | 2.209 | 2014-2018 | |
| 6 | Jorge Mendoza | 2.227 | 2038-2044 | |
| 7 | Clive Smedley | 2.442 | 2026-2039 | |
| 8 | Chandler Burns | 2.640 | 2024-2036 | |
| 9 | Felipe González# | 2.727 | 2048-2049 | |
| 10 | Clark Crawford | 2.899 | 2030-2038 | |
| 11 | Mark Clark | 2.908 | 2030-2048 | |
| 12 | Woodrow McKay | 2.945 | 2042-2049 | |
| 13 | Desi Bradley | 2.970 | 2021-2026 | |
| 14 | Tom Bancroft# | 3.086 | 2044-2050 | |
| 15 | Matt Carter | 3.231 | 2013-2019 | |
| 16 | James Martin | 3.279 | 2038-2046 | |
| 17 | Joe Hunt | 3.311 | 2026-2034 | |
| 18 | Kian Hayward# | 3.340 | 2047-2049 | |
| 19 | Ernest Nelson | 3.600 | 2019-2034 | |
| 20 | Huang-di Ning# | 3.774 | 2042-2044 | |
| 21 | Stan Long | 3.785 | 2025-2030 | |
| 22 | Mauro Olivas | 3.900 | 2013-2017 | |
| 23 | Bobby Sanders | 4.119 | 2028-2042 | |
| 24 | Toshikazu Higashi | 4.590 | 2021-2029 | |
| 25 | Henry Valentine | 5.327 | 2021-2031 | |
| 26 | Willis Hines | 5.442 | 2029-2037 |
