The greens at Pinehurst No. 2 are the signature of this Donald Ross course that hosts the 124th U.S. Open starting on Thursday. They go by any variety of names -- upside-down cereal bowls, inverted saucers, turtlebacks or domes. Whatever they're called, they are universally regarded as daunting, particularly for a U.S. Open already known as the toughest test in golf.
