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Dustin Johnson, 8 shots behind at US Open, knows how quickly a lead can shrink

Dustin Johnson hits from the fairway on the 10th hole during the second round of the U.S. Open golf tournament in Pinehurst, N.C., Friday, June 13, 2014. (AP Photo/Chuck Burton)

Dustin Johnson hits from the fairway on the 10th hole during the second round of the U.S. Open golf tournament in Pinehurst, N.C., Friday, June 13, 2014. (AP Photo/Chuck Burton)  (The Associated Press)

Dustin Johnson never imagined he could be at 2-under par through 36 holes at a U.S. Open and be eight shots behind.

Johnson had another 69 on Friday, nowhere close to keeping up with the record score of Martin Kaymer, who was at 10-under 130. Even so, Johnson is not ready to concede anything at Pinehurst No. 2.

And he speaks from experience.

Johnson had a three-shot lead going into the final round at Pebble Beach in 2010. It was gone in two holes, and Johnson closed with an 82. He says anything can happen in a U.S. Open.

He says he's not about to change his strategy and play more aggressively just because he's eight shots behind going into the weekend.