LOUISVILLE, Ky. (AP) — A PGA Championship filled with various layers of intrigue began Thursday after a 10-minute delay for fog, which quickly gave way to sunshine and a morning that figures to set the tone for Rory McIlroy, Tiger Woods and Jordan Spieth. Weather has been an issue all week, with rain at times closing Valhalla Golf Club for brief periods during two days of practice. McIlroy returns to the site of his last major 10 years ago that also was marked by weather when a two-hour rain delay on Sunday caused him to play into the group ahead so that he could finish before dark.