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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Hadde Ippel | .7012 | 1950-1953 | |
| 2 | Ian Grooms# | .5566 | 1971-1974 | |
| 3 | Dan Dethridge | .5449 | 1933-1936 | |
| 3 | Clement Powers | .5449 | 1937-1940 | |
| 5 | Héctor Alemán | .5360 | 1953-1956 | |
| 6 | Sotan Wakabayashi | .5348 | 1942-1945 | |
| 7 | Travis Brown | .5285 | 1947-1950 | |
| 8 | Erik Melton | .5189 | 1935-1938 | |
| 9 | Pedro Oporta | .5091 | 1939-1942 | |
| 10 | Frank Bailey | .5079 | 1943-1946 | |
| 11 | Bartolo Rosas | .5014 | 1955-1958 | |
| 12 | Lorenzo Mercado | .4884 | 1941-1944 | |
| 13 | Cong Hua | .4813 | 1938-1941 | |
| 14 | Raúl Rúbio | .4738 | 1935-1938 | |
| 15 | Merrill Wilkerson | .4733 | 1976-1979 | |
| 16 | Ed St. John | .4578 | 1937-1940 | |
| 17 | Riley Wells | .4538 | 1937-1940 | |
| 18 | Héctor Palomarez# | .4323 | 1976-1979 | |
| 19 | Ambrose Land | .4316 | 1939-1942 | |
| 20 | Eric Combs# | .4211 | 1978-1981 | |
| 21 | Mark Warren | .4169 | 1940-1943 | |
| 22 | Francisco Córdova | .4044 | 1938-1941 | |
| 23 | Armando Hernández | .3966 | 1926-1930 | |
| 24 | Mauro Morales | .3737 | 1942-1945 | |
| 25 | Christian Wilson | .3701 | 1957-1960 | |
| 26 | Jeff Cherry# | .3528 | 1976-1979 | |
| 27 | Jesse Wiggins | .3456 | 1911-1915 | |
| 28 | Liam Burgess# | .3339 | 1978-1981 | |
| 29 | Javier Alarcon# | .3221 | 1983-1986 |
