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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Rank | Player | OPS | YEAR | Open Season Leaderboard |
|---|---|---|---|---|
| 1 | Hadde Ippel | 1.1856 | 1950-1953 | |
| 2 | Clement Powers | 1.0055 | 1937-1940 | |
| 3 | Pedro Oporta | .9971 | 1939-1942 | |
| 4 | Erik Melton | .9970 | 1935-1938 | |
| 5 | Héctor Alemán | .9919 | 1953-1956 | |
| 6 | Sotan Wakabayashi | .9913 | 1942-1945 | |
| 7 | Dan Dethridge | .9883 | 1933-1936 | |
| 8 | Travis Brown | .9832 | 1947-1950 | |
| 9 | Frank Bailey | .9730 | 1943-1946 | |
| 10 | Lorenzo Mercado | .9715 | 1941-1944 | |
| 11 | Ian Grooms# | .9585 | 1971-1974 | |
| 12 | Ed St. John | .9333 | 1937-1940 | |
| 13 | Cong Hua | .9283 | 1938-1941 | |
| 14 | Raúl Rúbio | .9209 | 1935-1938 | |
| 15 | Riley Wells | .9118 | 1937-1940 | |
| 16 | Ambrose Land | .8822 | 1939-1942 | |
| 17 | Bartolo Rosas | .8745 | 1955-1958 | |
| 18 | Merrill Wilkerson | .8497 | 1976-1979 | |
| 19 | Mark Warren | .8378 | 1940-1943 | |
| 20 | Héctor Palomarez# | .8358 | 1976-1979 | |
| 21 | Francisco Córdova | .8243 | 1938-1941 | |
| 22 | Eric Combs# | .8079 | 1978-1981 | |
| 23 | Armando Hernández | .7975 | 1926-1930 | |
| 24 | Mauro Morales | .7616 | 1942-1945 | |
| 25 | Liam Burgess# | .7262 | 1978-1981 | |
| 26 | Jeff Cherry# | .7239 | 1976-1979 | |
| 27 | Christian Wilson | .7000 | 1957-1960 | |
| 28 | Jesse Wiggins | .6688 | 1911-1915 | |
| 29 | Javier Alarcon# | .6549 | 1983-1986 |
