Create perfect fighter! :)

Stamina of Rocky Marciano would be a good addition.

 

Chin - Hagler. Did anyone ever even hurt Hagler? He was granite.
Jab - Hearnes
Left hook - Frazier

 

Ali - Foot speed and chin
Frazier - Left hook and heart
Patterson - Hand speed
Tyson - Head movement
Holmes jab with Liston's power
Liston's reach
Shavers straight
Foreman uppercut

 

I'm going to start by giving Thomas Hearns the durability of Hagler, stamina of Sanchez and strength of Fenech.

You could also give Jones the chin of Hagler (just in case) and straight up you've got someone disgustingly hard to beat.

 

There's an article about Ingemar Johansonn's punching power where a British commentator named Reg Gutridge said if he wanted to make a perfect heavyweight champion it would be like this :

"It made for interesting reading and here are the components with which Reg constructed his boxing Frankenstein: The left jab of Larry Holmes; the left hook of Joe Louis; the counter-punching of Tommy Burns; the uppercut of George Foreman; the ring strategy of Gene Tunney; the footwork of Jim Corbett; the body punching of Bob Fitzsimmons; the raw power of Sonny Liston; the aggression of Rocky Marciano; the stamina of John L Sullivan; the chin of Jim Jeffries; the defensive skills of Jack Johnson; the physique of Ken Norton; the determination of Joe Frazier; the hand speed of Floyd Patterson; the close quarter work of Jack Dempsey; the sportsmanship of Jersey Joe Walcott; the strength of Primo Carnera and the flair of Muhammad Ali."

" One component, of course, is missing from that recipe, that of the best right hand. Gutteridge didn’t vote for Max Baer, as many might expect. The nod went to Ingemar Johansson and this writer was glad to hear it."