Dustin Johnson takes 4-shot lead into weekend at U.S. Open

Southampton, N.Y. • Shinnecock Hills is no longer the only challenge at this U.S. Open.On a course that can cause problems in any weather, where triple bogeys or worse have been recorded on all but six holes, perhaps the most daunting prospect going into the weekend is Dustin Johnson with a four-shot lead.Johnson played smart on the few occasions he was out of position, holed a 45-foot birdie putt on the par-3 seventh green and endured wind and two hours of rain Friday morning for a 3-under