Conversation so far:
What is Leonard v Lalonde?
Leonard faced Don Lalonde for Lalonde's WBC Light Heavyweight Championship and the newly created WBC Super Middleweight Championship.
Did Sugar Ray Leonard win against Don Lalonde?
Judges Chuck Giampa and Franz Marti had Leonard ahead by scores of 77–74 and 77–75, respectively.
What was Sugar Ray Leonard's greatest accomplishment?
Often regarded as one of the greatest boxers of all time, he competed from 1977 to 1997, winning world titles in five weight divisions.
What was Sugar Ray Leonard's best fight?
Sugar Ray Leonard vs. Roberto Durán II, known as the No Más Fight, was a boxing match where Durán turned towards the referee and quit by apparently saying, No más.

Question: What is the most important fact in this article?
Self-contained rewrite: What is the most important fact in this article on Sugar Ray Leonard besides his fights with Lalonde and Durán?