Rematches that didnt happen that u wish had..

[THE THIRD MAN]

Ali V Foreman (Was Foreman that demoralized?)
Sanchez V Nelson (It would've happened if not for untimely death)
Hagler V Hearns (Such an amazing 3 rounds, maybe Tommy could've turned it around?)
Hagler V Leonard (Strange this didn't happen?)
Chavez V Whitaker (Should've been automatic,worst decision i have seen)
Jones jr V Hopkins (1994) (Hopkins did well in that first fight, 6 months later, who knows?)
DLH V Whitaker (It was close, possibly Sweet Pea's final hurrah?)
DLH V Trinidad (DLH deserved a rematch, he won that fight!)
Klitschko V Lewis (if not for cuts, Lewis was in trouble)
Barrera V Hamed (Only to see Hamed humiliated again!)

This is a great list. I'd just remove Barrera/Hamed -- though I know you didn't include it for the same reason -- and replace it with Hopkins/Calzaghe -- fan reaction is very mixed on who deserved the first one; although a rematch may well have been just as inconclusive.

It was a close fight and probably should've seen a rematch, Hopkins just didn't do enough to beat Joe Balls that night.

[Slim the BoxingManiac]

Ali showed that you have to withstand the barrage to beat Foreman, and Chuvalo didn't get the chance.

...neither did Joe Frazier

Joe Frazier was knocked down a bunch of times. Chuvalo was never knocked down, and was still on his feet with his defense up, waiting for the barrage to end.

[roberto duran legend]

Duran v Laing , a peak Duran would flatten him.