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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | SLG | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Mark Borton | .4814 | 1957-1962 | |
| 2 | Jaleel bin Dharr# | .4806 | 1985-1990 | |
| 3 | Dan Oliver* | .4763 | 1929-1944 | |
| 4 | José Costa# | .4740 | 1982-1987 | |
| 5 | Damon Brown | .4714 | 1944-1952 | |
| 6 | Mark McCoy | .4591 | 1931-1946 | |
| 7 | Johnny De La Rosa | .4567 | 1935-1952 | |
| 8 | Dave Gosse | .4547 | 1932-1945 | |
| 9 | Eric Hill | .4531 | 1930-1943 | |
| 10 | Tokuhei Kumagai | .4471 | 1949-1959 | |
| 11 | Bennett Davis | .4275 | 1971-1980 | |
| 12 | Harrison Wellby | .4219 | 1932-1945 | |
| 13 | Leander Sakellariou | .4208 | 1944-1958 | |
| 14 | Juan García | .4108 | 1980-1985 | |
| 15 | Donal Pagan | .4094 | 1933-1948 | |
| 16 | Jean Texier | .4001 | 1942-1952 | |
| 17 | Venkatesha Rajashi | .3873 | 1973-1980 | |
| 18 | Pedro Cabrera | .3803 | 1951-1957 | |
| 19 | Lee Myers | .3641 | 1960-1973 | |
| 20 | Shoichi Seki | .3609 | 1935-1949 |
