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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Jeff Giles | .7350 | 1950-1953 | |
| 2 | Wyatt Newman | .6881 | 1954-1957 | |
| 3 | Jon Murphy | .6142 | 1949-1952 | |
| 4 | Tommy Gove | .5836 | 1949-1952 | |
| 5 | Chuck Bowman | .5623 | 1962-1965 | |
| 6 | Rafael Guerrero | .5392 | 1959-1962 | |
| 7 | Eugene Henderson | .5314 | 1959-1962 | |
| 8 | Brennan MacFadden | .5016 | 1927-1930 | |
| 9 | Rick Cook | .4786 | 1954-1957 | |
| 10 | Howard Lawrence | .4674 | 1937-1940 | |
| 11 | Cody Ruffin | .4510 | 1949-1952 | |
| 12 | Mauro Rodríguez# | .3984 | 1974-1977 |
