Due to circumstances......
IMO
It is Between
Muhammed Ali vs Teofilo Stevenson(at heavyweight it could've happened in the late 70s if Stevenson was allowed to turn pro)
or
Salvador Sanchez vs Julio C. Chavez Sr.(at lightweight it could've happened in the early 80s if Sal Sanchez would've not died R.I.P)
IMO
It is Between
Muhammed Ali vs Teofilo Stevenson(at heavyweight it could've happened in the late 70s if Stevenson was allowed to turn pro)
or
Salvador Sanchez vs Julio C. Chavez Sr.(at lightweight it could've happened in the early 80s if Sal Sanchez would've not died R.I.P)
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