Sparring with Hemingway was a book that included bouts with the undisputed champion of what weight class from 1980 to 1987?
Sparring with Hemingway:  The book includes descriptions of fights between Marciano and Archie Moore; Ali and Foreman; Leonard and Duran; and Hagler and Hearns. Marvelous Marvin Hagler:  He reigned as the undisputed middleweight champion from 1980 to 1987, making twelve defenses of that title, and currently holds the highest knockout percentage of all undisputed middleweight champions, at 78%.
middleweight