By Mark Lamport-Stokes OAKMONT, Pennsylvania (Reuters) - While soaking up perhaps the greatest pressure he has ever experienced, Dustin Johnson delivered a perfect riposte to criticism of his major credentials with a drama-laden U.S. Open victory on Sunday. "Obviously winning any tournament, there's a lot of satisfaction, but to get it done in a major, especially when I've been so close so many times, it's just an unbelievable feeling," said Johnson. More...