The season's final major is upon us with the PGA Championship at Charlotte's Quail Hollow Club, and the biggest storyline is whether Jordan Spieth can complete the career Grand Slam. Golf Digest editors Sam Weinman, Ryan Herrington, Alex Myers, and Joel Beall discuss Spieth's chances, whether his feat would be more impressive than when Tiger Woods did it, as well as how Rory McIlroy is expected to fare with a new caddie in tow.