OAKMONT, Pa. (AP) -- Dustin Johnson unleashed another powerful tee shot that got lost in the darkening sky over Oakmont. Positioned some 200 yards away on a forward tee, his caddie tried to track the flight of the ball until he gave up and said, ''Where did it go?''
Like he even had to ask.
One year after Johnson let the U.S. Open slip away from him at Chambers Bay, he drove his way to the top of the leaderboard Friday at Oakmont on a marathon day of 36 holes with rounds of 67-69 that left him poised for another shot at a major.