Jordan Spieth of the United States with his caddie Michael Greller on the first hole during the final round of the 146th Open Championship at Royal Birkdale on July 23, 2017 in Southport, England. Stuart Franklin / Getty Images
Jordan Spieth of the United States with his caddie Michael Greller on the first hole during the final round of the 146th Open Championship at Royal Birkdale on July 23, 2017 in Southport, England. StuShow more
Partners: Jordan Spieth hits the shots, but caddie Michael Greller picks the spots
It turns out the American’s shoot-the-lights-out finish to win the British Open, the one that clinched a first Claret Jug, had much to do with the man on his bag