You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "Sparring with Hemingway was a book that included bouts with the undisputed champion of what weight class from 1980 to 1987?" whose answer is middleweight.
Each document should contain about 30 words, and these documents should contain useful information.

Query: undisputed boxing champion weight class 1980-1987
Useful Output:

Doc 1: Death of Marvelous Marvin Hagler, who was the undisputed middleweight champion of the world from 1980 to 1987, announced by his wife;
Doc 2: It depends in the quality of opposition that the fighter encounters. Marvin Hagler was an undisputed middleweight champion from 1980-86.
Doc 3: Marvin Hagler, the undisputed middleweight champion from 1980-1987, has sadly passed away. He was a man of honor and a man of his word.
Doc 4: Boxing legend Marvin Hagler has died at 66. He was the undisputed middleweight champion from 1980 to 1987. One of the greatest boxers ever to do it.
Doc 5: Lloyd Honeyghan is a former professional British boxer who competed from 1980 to 1995. He reigned as the undisputed welterweight champion from