The 100th PGA Championship tees off Thursday morning at Bellerive Country Club in St. Louis. Fans have been lining up to watch top golfers like Tiger Woods, Jordan Spieth and Justin Thomas play in the practice rounds. This year marks the 28th consecutive year CBS Sports has broadcast the championship. CBS Sports' Jim Nantz has anchored the PGA Championship broadcast since 1991. He joins "CBS This Morning" from St. Louis to discuss what we can expect from this year's tournament.