TIL of Eddie Futch who trained four of the five fighters (Joe Frazier, Ken Norton, Larry Holmes and Trevor Berbick), who defeated Muhammad Ali.

https://en.wikipedia.org/wiki/Eddie_Futch

https://www.reddit.com/r/todayilearned/comments/15yy552/til_of_eddie_futch_who_trained_four_of_the_five/