I don't know (don't mean to piss any one off) IMO Joe lewis edges Ali. Just because of the era.
Tiger Woods isn't done yet, Till that Jack.
Wouldn't know anything about soccer without Pele.
Football Dan Marino
Basketball Jordan Of course
Lance Armstrong (be for you say anything, watch the Tour De Frog.)
Babe Roth.
Motor Cycle racing GP Kevin Schwantz, Mick Doohan. (Tie to me) Super Bike Carl Fogerty (even if he disliked Americans.) Devil his due kinda thing.