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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Jack Croucher# | 2.37 | 2040-2041 | |
| 2 | Héctor Sanz# | 2.59 | 2036-2039 | |
| 3 | Pepe Fontirroig# | 2.75 | 2035-2037 | |
| 4 | Mauro Sandín# | 2.82 | 2036-2039 | |
| 5 | Jeremiah Hartney# | 3.04 | 2039-2041 | |
| 6 | Joe Haynes# | 3.07 | 2036-2037 | |
| 7 | Emilio Zatori# | 3.13 | 2036-2040 | |
| 8 | Malcolm Bullard# | 3.18 | 2033-2036 | |
| 8 | Earl Hurdle# | 3.18 | 2037-2040 | |
| 10 | Stanton Ryan | 3.41 | 2034-2035 | |
| 11 | Blaise Tonetti# | 3.47 | 2038-2041 | |
| 12 | Claude Khatoon# | 3.59 | 2037-2039 | |
| 13 | Armando Sosa# | 3.63 | 2037-2039 | |
| 14 | Jayden Fairhead# | 3.68 | 2036-2037 | |
| 15 | Jin-soo Jan-Hui# | 3.70 | 2034-2036 | |
| 16 | Jo Yamasaki | 3.71 | 2034-2035 | |
| 17 | Rafael Gallegos# | 3.76 | 2035-2038 | |
| 18 | Jack Forrest# | 3.80 | 2039-2041 | |
| 19 | Daniel O'Toole | 3.85 | 2038-2041 | |
| 20 | Nick Joseph# | 3.93 | 2038-2040 | |
| 21 | Mark Kirk# | 3.94 | 2036-2038 | |
| 22 | Francisco Medine | 4.00 | 2032-2033 | |
| 23 | Carlos López | 4.02 | 2032-2033 | |
| 24 | Moriz Gaidamakin# | 4.04 | 2033-2036 | |
| 25 | Ronald Hall | 4.09 | 2033-2037 | |
| 26 | Diego Cartaya | 4.21 | 2032-2035 | |
| 26 | Robert Young# | 4.21 | 2039-2041 | |
| 28 | Zhi-qiang Ku# | 4.37 | 2035-2037 | |
| 29 | Vítor Paiva | 4.42 | 2032-2035 | |
| 30 | Jack Crabb | 4.45 | 2032-2034 | |
| 31 | Naoaki Iwasaki | 4.53 | 2033-2035 | |
| 32 | Ed Callahan# | 4.63 | 2037-2039 | |
| 33 | Gaberiela Tatafu# | 4.70 | 2033-2036 | |
| 34 | Richard Arnie# | 5.04 | 2033-2035 | |
| 35 | Brant Mielke | 5.11 | 2033-2035 | |
| 36 | Ron Francis# | 5.14 | 2038-2040 | |
| 37 | Chris Rice# | 5.22 | 2035-2038 |
