What the competitors and caddies used at the U.S. Open Championship.
The maker of PGA TOUR and major professional and amateur championship yardage books.
MARK LONG
PGA TOUR Caddie
Mark Long is a veteran PGA TOUR Caddie. But he doesn’t work for just one player. For many years he has made the yardage books the caddies and players use on the PGA TOUR as well as at the United States Open Championship, the PGA Championship, and the Ryder Cup.