Duel in the Sun: Alberto Salazar, Dick Beardsley, and America's Greatest Marathon is a 2006 book by freelance sportswriter John Brant.

Brant, a regular contributor to Runner's World since 1985 and a contributing editor at Outside, uses a writing style in the book that relies heavily on flashbacks and foreshadowing.

The early part of the book describes the preparations that Beardsley and Salazar underwent before the marathon, along with many other aspects of the men's running backgrounds and personal lives.

The title comes from the two men's shadows cast by the hot sun onto the pavement as they run "in each other's pockets" during the final miles of the race, and anticipation builds as to who will win the "duel."

The book describes in detail Salazar's depression and compromised immune system, and Beardsley's industrial accident and drug addiction.