Who would win these matchups?

Question

Dempsey vs Tyson

Marciano vs Frazier

Dempsey vs Frazier

Marciano vs Tyson

Frazier vs Tyson

Marciano vs Dempsey

Answer 1

Simple:

Dempsey by teeth busting kayo over Tyson

Marciano kayo Frazier

Dempsey kayo Frazier

Marciano by homicide over Tyson

Frazier by decapitation over Tyson

Marciano late kayo  Dempsey

Answer 2

The Blogbaba's List reads like this.

Dempsey by KO over Tyson, Mike wouldn't make it back to his stool and would quit about a minute into the first round.

Marciano by KO over Frazier inside one round, with Frazier giving it all he had for the first minute and a half before the inevitable occurs.

Dempsey's aggression gets the better of Frazier inside of one round.  Dempsey by KO about as fast as Marciano both finishing Joe's boy within two minutes.

Marciano's shadow falls on Mike crushing any resistance Tyson might have brought into the ring long before the first bell sounds, Mike quits on his stool without ever throwing a punch.  Marciano by TKO at 0.01 of the first.

Marvis matches up well with Tyson their skill levels were similar with a slight power edge to Mike.  Joe didn't raise his son to be a quitter, and there was no shortage of heart in the Frazier household, Marvis would KO Tyson after a shaky start within six rounds, Mike simply lacked the heart to stay in the ring with a fighter who wasn't terrified of him.

Marciano would have eventually out lasted Dempsey in one of the boxing rings all time great match ups, this one would have been Hearns/Hagler for at least 10 rounds before Dempsey ran into that Susie-Q.  Marciano by KO in 11 rounds.

Great match up between two of boxings best heavyweights, the Marvis Frazier/Mike Tyson match up was pretty even, but they were both totally out classed by Marciano and Dempsey.