7. 18th at Whistling Straits -- Par 4, 500 yards -- Kohler, Wisc.
Nicknamed Dye-abolical (after designer Pete Dye) it’s best known today as the hole that did in Dustin Johnson at the 2010 PGA Championship. But this beastly par 4 has undone many others. Among them, Justin Leonard, who, needing a par to win the 2004 PGA, carried the long gorge on his tee shot, then sailed over another that guards the green, only to land in a grassy hollow, just steps from the putting surface, with little hope of getting up and down. He didn’t, and lost in a playoff to Vijay Singh.