* Dustin Johnson fires 66 for outright lead
* Spieth and McIlroy card 71s
* Woods putts poorly on the way to 75 (Updates after McIlroy, Spieth finish)
By Mark Lamport-Stokes
KOHLER, Wisconsin, Aug 13 (Reuters) - Dustin Johnson, so often the nearly man in recent majors, took advantage of relatively calm early conditions to seize a one-shot lead in the opening round of the 97th PGA Championship on Thursday.
While most golf fans eagerly awaited the 'Rory and Jordan' show that was to unfold in the afternoon at Whistling Straits, the long-hitting American racked up an eagle at the par-five 16th, five birdies and a bogey to card a six-under-par 66.