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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | ERA | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Cisco Blondet | 2.109 | 2051-2055 | |
| 2 | Kelly Bowen | 2.253 | 2032-2036 | |
| 3 | Cristo Rovlaz | 2.317 | 2036-2040 | |
| 4 | Alonso Pérez | 2.524 | 2074-2088 | |
| 5 | Carter Folsom | 2.701 | 2040-2053 | |
| 6 | Steve Ross | 2.760 | 2044-2060 | |
| 7 | Manny Velasco | 2.807 | 2037-2052 | |
| 8 | Pete Branson | 2.887 | 2031-2038 | |
| 9 | Patrick Lowe | 2.890 | 2041-2047 | |
| 10 | Rhett Clark | 2.954 | 2031-2036 | |
| 11 | Ben Sanders | 2.958 | 2039-2051 | |
| 12 | Ed Ward# | 2.979 | 2087-2095 | |
| 13 | Rubén Vidal | 3.029 | 2084-2092 | |
| 14 | Jim Marshall | 3.063 | 2070-2082 | |
| 15 | Willie Scott | 3.070 | 2041-2047 | |
| 16 | Nick Mitchell | 3.071 | 2043-2056 | |
| 17 | Garza Burns | 3.079 | 2030-2035 | |
| 18 | Rick Booth# | 3.104 | 2086-2095 | |
| 19 | Sergio Ortega | 3.124 | 2041-2047 | |
| 20 | Dong-hua Qing | 3.130 | 2031-2036 | |
| 21 | Charlie Collins | 3.151 | 2031-2035 | |
| 22 | Adam Douglas | 3.174 | 2077-2089 | |
| 23 | Bob Delgado | 3.191 | 2039-2049 | |
| 24 | Sam Hopkins | 3.211 | 2038-2045 | |
| 25 | Eduardo Águila | 3.240 | 2085-2093 | |
| 26 | Timothee Capellari | 3.246 | 2085-2094 | |
| 27 | Jack Thompson# | 3.316 | 2088-2094 | |
| 28 | Sergio Alemán | 3.330 | 2052-2058 | |
| 29 | Brian Lyttelton | 3.341 | 2063-2072 | |
| 30 | Enrique Aguilar | 3.351 | 2061-2078 | |
| 31 | José Chávez | 3.370 | 2073-2082 | |
| 32 | Sidney Rose | 3.396 | 2076-2083 | |
| 32 | José Luna | 3.396 | 2072-2080 | |
| 34 | Javier Ruíz | 3.407 | 2088-2095 | |
| 35 | Anastasio Jordan | 3.448 | 2076-2087 | |
| 36 | Alex Porter | 3.462 | 2046-2053 | |
| 37 | Bert McCullough# | 3.470 | 2089-2095 | |
| 38 | Jimmy Trudel | 3.477 | 2053-2057 | |
| 39 | Jaime Rivera | 3.510 | 2077-2084 | |
| 40 | Barney Singleton | 3.514 | 2066-2075 | |
| 41 | Albert Hunter | 3.520 | 2074-2088 | |
| 42 | Dan Guzmán | 3.553 | 2081-2088 | |
| 43 | António Delgado | 3.566 | 2069-2083 | |
| 44 | Luis Salas | 3.568 | 2070-2082 | |
| 44 | Mel Olson | 3.568 | 2078-2090 | |
| 46 | Juan Colareta | 3.571 | 2078-2085 | |
| 47 | Anthony Bryan | 3.614 | 2043-2052 | |
| 48 | Tim Morrison | 3.650 | 2074-2082 | |
| 49 | A.R. Mills | 3.664 | 2050-2057 | |
| 50 | Juan Zúñiga# | 3.677 | 2088-2095 | |
| 51 | Morgan Foster | 3.682 | 2076-2085 | |
| 52 | Vince Wear | 3.727 | 2079-2086 | |
| 53 | José García | 3.730 | 2088-2095 | |
| 54 | Mitchell Díaz | 3.748 | 2071-2083 | |
| 55 | Nicholas Mata | 3.768 | 2080-2085 | |
| 56 | Elder Rosa | 3.780 | 2076-2083 | |
| 57 | Will Horton | 3.788 | 2043-2050 | |
| 58 | Ramón Gutiérrez | 3.805 | 2077-2093 | |
| 59 | Ben Bullard | 3.849 | 2075-2083 | |
| 60 | Jim Adams | 3.895 | 2073-2079 | |
| 61 | Cristián Toledo | 3.908 | 2073-2084 | |
| 62 | Rafael Church | 4.025 | 2076-2084 | |
| 63 | Julián Acevedo | 4.038 | 2065-2075 | |
| 64 | Cal Miller | 4.116 | 2032-2040 | |
| 65 | Andy Shannon | 4.158 | 2075-2085 | |
| 66 | Juan Espinoza | 4.354 | 2067-2077 | |
| 67 | Javier Díaz | 4.372 | 2069-2086 | |
| 68 | Thomas O'Devin | 4.594 | 2068-2081 | |
| 69 | Anastasio Bardi | 4.599 | 2072-2077 | |
| 70 | Robert Fernández | 4.767 | 2070-2083 | |
| 71 | Vaughan West | 4.793 | 2069-2078 | |
| 72 | Tim Greer | 5.020 | 2071-2081 |
