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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | John Sparks# | 2.48 | 2036-2037 | |
| 2 | Héctor Sanz# | 2.59 | 2036-2039 | |
| 3 | Pepe Fontirroig# | 2.75 | 2035-2037 | |
| 4 | Mauro Sandín# | 2.82 | 2036-2039 | |
| 5 | Wynn Kelley# | 2.99 | 2037-2039 | |
| 6 | Joe Haynes# | 3.07 | 2036-2037 | |
| 7 | Malcolm Bullard# | 3.18 | 2033-2036 | |
| 8 | Miguel Ávila | 3.23 | 2032-2033 | |
| 9 | Emilio Zatori# | 3.25 | 2036-2038 | |
| 10 | Stanton Ryan | 3.41 | 2034-2035 | |
| 11 | José Guerrero# | 3.56 | 2038-2039 | |
| 12 | Earl Hurdle# | 3.58 | 2037-2039 | |
| 12 | Walt Hart | 3.58 | 2034-2035 | |
| 14 | Claude Khatoon# | 3.59 | 2037-2039 | |
| 15 | Armando Sosa# | 3.63 | 2037-2039 | |
| 16 | Hugo Piñón# | 3.64 | 2037-2039 | |
| 17 | Jayden Fairhead# | 3.68 | 2036-2037 | |
| 18 | Chi-young Zamora | 3.70 | 2032-2034 | |
| 18 | Jin-soo Jan-Hui# | 3.70 | 2034-2036 | |
| 20 | Jo Yamasaki# | 3.71 | 2034-2035 | |
| 21 | Pjotr de Moor# | 3.73 | 2033-2035 | |
| 22 | Rafael Gallegos# | 3.76 | 2035-2038 | |
| 23 | Nick Joseph# | 3.78 | 2038-2039 | |
| 24 | John Lee# | 3.86 | 2035-2037 | |
| 25 | Mark Kirk# | 3.94 | 2036-2038 | |
| 26 | Rens Verheijen# | 3.98 | 2035-2037 | |
| 27 | Francisco Medine# | 4.00 | 2032-2033 | |
| 28 | Carlos López# | 4.02 | 2032-2033 | |
| 29 | Moriz Gaidamakin# | 4.04 | 2033-2036 | |
| 29 | Carlos Vargas# | 4.04 | 2032-2033 | |
| 31 | Ronald Hall# | 4.09 | 2033-2037 | |
| 32 | Diego Cartaya# | 4.21 | 2032-2035 | |
| 33 | William Dustin | 4.34 | 2034-2035 | |
| 34 | Zhi-qiang Ku# | 4.37 | 2035-2037 | |
| 35 | Vítor Paiva# | 4.42 | 2032-2035 | |
| 36 | Jack Crabb | 4.45 | 2032-2034 | |
| 37 | Naoaki Iwasaki | 4.53 | 2033-2035 | |
| 38 | Ed Callahan# | 4.63 | 2037-2039 | |
| 39 | Gaberiela Tatafu# | 4.70 | 2033-2036 | |
| 40 | Minato Futamura# | 4.75 | 2036-2038 | |
| 41 | Richard Arnie# | 5.04 | 2033-2035 | |
| 42 | Brant Mielke | 5.11 | 2033-2035 | |
| 43 | Lucas Gameiro# | 5.19 | 2034-2035 | |
| 44 | Chris Rice# | 5.22 | 2035-2038 |
