The way I see it Hearns Roldan Antuifermo Duran Mugabi Extra bonus points of course for knocking out Roy Jones.
I think the Alan Minter win has to rank up there in his top five. Minter was undisputed champion and on a pretty good run of victories.
Minter, for obvious reasons, it got him the title. Plus, he was a man-eating beast in that fight. The Hart fight. He'd lost his first two Philly tests against Monroe and Watts (say what you will about the Watts decision). He really needed to win that third try at it. Another loss would have been a big black mark. Hearns. He became a superstar with that one. Sibson (or Scypion) - He just looked razor sharp there. From a pure boxing standpoint he was as good there as he'd ever been, and seemed to come into his own as a confident champion. Monroe rematch. He got the guy that got him. That was a big confidence booster.
Hagler's CV is so vast I think it's very difficult to narrow it down to 5 wins, it also depends on what the OP means by "best" - best performance or most significant? Further, this side of the pond, MMH didn't get a lot of TV coverage pre circa 1979 so a lot of his earlier fights weren't seen here. I thought the Mugabi wasn't a great performance, gutsy, but skill wise Marvin had slipped a long way. The 5 I've seen and studied that I would say were most impressive: Minter - I was at this fight: Hagler, in an incredibly hostile atmosphere, was nerveless, clinical, ruthless & vicious. Sibson - technically brilliant. Hearns - both monstrous and tactically very good in a hugely significant fight - took advantage of the fact that Hearns had only faced 1 southpaw as pro - a few times Hearns tripped over Marvin's lead right foot. Hamsho 1 & 2 - completely outclassed a very tough challenger in 1 & upped the ante & took him apart in 2.
Had Marvin not been robbed of the win in the first Vito fight, Minter's name would not be on the list of middleweight champions. Hagler should have been granted an immediate rematch. Instead Minter got the call, won and even gave Antuofermo a return to delay the inevitable destruction and very belated coronation of the avoided Hagler.
