@Bruno - just in case, you wouldn't know about the story:
'Class' is in 'South of No North' and it's about Chinaski fighting Hem in the ring, kayoing him, and then gets discovered as a writer.
In a letter to the Webbs (as early as Dec 7, 1963) he stated on that very subject:
"I remember when I was very young, Hem used to work out in the ring, you know, and Ialways dreamed that I would volunteer to sit in the opposite corner, and in my dream, of course, I kayoed HEMINGWAY, and therefore I was a greater writer, I was a greater everything."