I should pay more attention to the original article - Epstein actually references that Wallace story.
Davis Miller's two books: "The Zen of Muhammed Ali - and other Obsessions" and "The Tao of Bruce Lee" are both quality reads. The first is a collection of his essays, in particular "My Dinner with Ali" - which is excellent.
It's not written by a sports writer as such, but David Foster Wallace's article in the NY Times is outstanding prose. A long piece, but well worth the read, and some wonderfully descriptive passages.
http://www.nytimes.com/2006/08/20/sports/playmagazine/20federer.html?_r=3&pagewanted=all
Oddly enough - it's about Roger Federer as well. He is an incredible athlete.