Legends who sparred but never fought

Frazier vs holmes
frazier vs norton
Liston vs Foreman
johansson vs ali

Doesn't need to be heavyweight, Man these would of been good fights.

 

Dempsey and Greb come to mind right away. Then I think of all the sibling legends who sparred, like the Spinks brothers, the Baer brothers, the Fullmer boys, the Viruets, various members of Manny Steward's Kronk clan, and now let's see what cascade of other names are triggered by this intriguing question.

 

Within this particular historic context, Tunney and Corbett shouldn't be forgotten.

If exhibitions are to be included, Dempsey stepped into the ring with both Schmeling and Max Baer. He also famously put out Galento's lights in Stillman's Gym, something never achieved by any of Two-Ton's opponents in 110 official contests. It's common knowledge that Lou Stillman described the hook Jack laid out Galento with as the hardest single punch he ever witnessed.

Joe Louis had exhibitions with Tiger Jack Fox, Harry Wills, Nino Valdez, Elmer Ray and Rex Layne.

 

When Ali was sparring for berbick he used tommy hearns.