Jay Haas, the United States Presidents Cup captain, held up a finger to gauge which direction the wind was blowing and somehow missed the gales of change that swept through the PGA Tour in 2015, toppling the established stars and allowing 20-something players like Rickie Fowler, Jordan Spieth, Rory McIlroy and Jason Day to grow toward the spotlight.
Given the choice between the 25-year-old Brooks Koepka, a 2015 tour winner with top-10 finishes in the last two majors and a No. 17 world ranking, or Phil Mickelson, 45, who has not won since the 2013 British Open and is ranked No.