I'm goin' with Duran. Roberto was smart enough and fast enough to catch up to The Wizzard, and I expect he'd land the harder punches.

Of the boxers listed in the OP: 1. Jim Jeffries 2. Sam Langford 3. Jack Dempsey 4. Jack Johnson 5. Joe Jeanette 6. Sam McVey 7. Harry Wills - Jeffries, Langford, Dempsey, Johnson are all ATGs. Johnson is my lowest ranked fighter among them at #27 all-time PFP. The last 3 are very good and borderline...

Sam Langford, of course, was never a champion, although, of course, he should have been. He stood 5'6' as a 185 lb. HW.

Just thought I'd add that.

I'd pick Tunney to win a decision by 5 or 6 points. I think Walcott's only real advantage is in power, but I can't see him KOing The Fighting Marine if Dempsey couldn't. Tunney was too smart and patient for Jersey. Tunney would have him figured, by the middle rounds, much like Mayweather figured out...

I've always hated Ali, but he would win. Dempsey had trouble with shifty, quicker fighters like Tommy Gibbons. Ali also had a great chin, so it'd' be hard for Dempsey to win w/ one punch.

Here's some of mine: Gunboat Smith: read about him in "In This Corner" by Heller Young Griffo: the best alcoholic fighter of all time. Griffo would show up drunk for fights, and could even be seen drinking wine in his corner b/t rounds. They still couldn't find the enigmatic Griffo; the or...

Since Jeff fought in 25 round championship fights & Joe fought 15 rounders, i'll put them in the ring for an even 20... I think Jeff is the better of the two men, but Louis is a tough matchup for him. Joe is maybe one of two or three men who could hit hard enough to KO the Boilermaker. I think J...