The U.S. Open is the toughest major championship in golf. The USGA does its best to make the course incredibly difficult to shoot par. The fairways are narrow, the rough is thicker and more abundant, the greens are a nightmare and the hole locations are in absurd spots. This year’s U.S. Open starts Thursday at Chambers Bay in Washington. Judging by the early condition of the greens, it’s going to be a real challenge to putt with any consistency. Put simply, the greens are a mess. Martin Kaymer won last year’s U.S. Open at 9-under par, which is a rare score for this tournament. Normally the winner is much closer to even