I'm disgusted by the disrespect the great Joe Frazier is getting here. What was Muhammad Ali, a midget?
Frazier would beat Vitali, but Borges is wrong to say Vitali cant fight. Vitali can fight, he's one of the few heavyweights today who can. But Joe Frazier would beat him up. Vitali Klitschko is not a huge puncher like George Foreman was, his arm punches wouldn't deter a prime Frazier. Smokin Joe would wear him down.
You do realise that Frazier would be, by far, the smallest opponent of Vitali's career? That nobody, not even 6'5 ATG Lennox Lewis, outlanded Vitali in a fight? Vitali with his height and reflexes is extremely difficult to hit. Frazier's style depended on his ability to take two to land one and against Ali that worked once in three fights because Ali didn't punch that hard and had to adjust to a slightly different fighting style with his reflexes and speed having lessened. Against Vitali, that kind of pressure style from an undersized fighter is the worst possible matchup. A defensive artist would probably be a bigger challenge for Vitali than a small pressure fighter.
Arreola needs to lose some fat and build some muscle, not going to make that much of a difference, but it is a game of inches and he is carrying too many around his waist.