The fast, heaving greens at Oakland Hills are famous. But are they on the verge of becoming infamous?

After a tidy 69 today, Billy Mayfair issued a stern warning: “The greens are getting very hard and very crusty and it's hard to stop the ball close to the hole. I just hope they don't lose the greens, because if the wind stays up and the sun stays out and we don't get any rain, we're close."

Pushing the limits of a golf course is one thing. That's what majors are all about. Crossing the limit? Well, just ask the folks on hand at the 2004 U.S. Open how that worked out.