Why is Jordan Spieth in position to join Ben Hogan (1953) and Tiger Woods (2000) as the only men to win three professional majors in a year?
There's his work ethic, for one. At one point Friday he was the only player at the full-swing practice area, oblivious to the searing afternoon heat.
And in describing the 49-foot bunker shot he holed on No. 18, he revealed that he had consulted local caddies regarding some of Whistling Straits' 1,000-plus bunkers.
"That bunker, and I think one other, have much more sand than the rest," said Spieth, who is three off the PGA Championship lead after a second-round 67.