in my opinion this is the most obvious answer ever in boxing. There's no connection between this man and Pacquiao so you must have never heard of him. This content is protected
Not in terms of how well known but Manny Melchor, who was then 19-15-4 beating Fahlan Sakkreerin (who was 21-1-1) for the IBF Miniweight title must be up their
Man this thread gets repeated alot. If you know at least a little about boxing, Douglas defeating Tyson, is arguably the biggest upset in all of sports history, let alone boxing.