Jack Fleck had the slimmest of resumes as a professional tournament golfer. He had never come close to winning on the PGA Tour, and was in the mere qualifier category when it came time for the 1955 U.S. Open at the Olympic Golf Club in San Francisco. A qualifier, in the parlance, is not even a contender; he just fills out the field. Yet Fleck got himself into a playoff with Ben Hogan, one of the greatest players in golf history, for the game's most...