PGA Championship 2015: Dark Horses, Long Shots Who Could Win Wanamaker Trophy

We know who the favorites for the 2015 PGA Championship at Whistling Straits are: Jordan Spieth, Rory McIlroy, Jason Day, Dustin Johnson, Bubba Watson and Justin Rose.   Jordan Spieth's pair of major triumphs and Zach Johnson's win at St. Andrews may suggest that you needn't look beyond the favorites to pick a winner. However, looking to recent history, three of the last five PGA Championship winners were unexpected: Jason Dufner in 2013, Keegan Bradley in 2011 and Martin Kaymer in 2010. More t...