Mayweather, sadly. Bobby's just too vulnerable to about everything by then, and Roger was also too rangy and good at foiling attacks. The referee rescues Chacon about 8-10 rounds in.
83...so this is the last motivated Chacon we'll see...hard fought split decision by Roger still, Bobby was definitely past it,and while I kinda doubt it a bit I believe he can channel some Rocky Lockridge on Roger.
Agree that Chacon is too spent by 83. Mayweather too long and rangy for the more compact Chacon to overcome at this point