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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Enrique López | .6458 | 1940-1943 | |
| 2 | Dylan Aston | .6368 | 1934-1937 | |
| 3 | Aurelio Hernández* | .6003 | 1954-1957 | |
| 4 | Martin Colbert | .5839 | 1926-1929 | |
| 5 | Javier Negrete | .5716 | 1957-1960 | |
| 6 | Arthur Martínez | .5425 | 1939-1942 | |
| 7 | Shahnawaz Mirza | .5322 | 1942-1945 | |
| 8 | António Rivera | .5128 | 1938-1941 | |
| 9 | Matt Crowther | .5034 | 1949-1952 | |
| 10 | Dan Estes | .4951 | 1967-1972 | |
| 11 | Ed Smith | .4679 | 1967-1970 | |
| 12 | Fred Walker# | .4534 | 1984-1987 | |
| 13 | Steve Lee | .4458 | 1948-1951 |
