Story Lines:
_Jordan Spieth goes for the career Grand Slam, which would make him only the sixth ever to do it
_Tiger Woods continues his comeback from back surgery and shoots for his first major title in 10 years
_Bellerive Country Club's greens are soft, giving golfers license to fire away at flagsticks and collect birdies by the bushel
_This is the 100th PGA Championship. As Rory McIlroy said, "The 100th year of anything is a big deal."
_McIlroy is going for his third Wanamaker Trophy and trying to end a major title drought that began after he won this event in 2014