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.

Question: What was his greatest accomplishment?
Self-contained rewrite: What was Sugar Ray Leonard's greatest accomplishment?