SOUTHAMPTON, N.Y. (AP) — Dustin Johnson had a four-stroke lead after 36 holes and was still in striking distance heading onto the back nine in the final round of the U.S. Open. Instead of making a move, he lost ground. The 2016 champion three-putted three times on the back nine at Shinnecock Hills, shooting an even-par 70 on Sunday to finish third, two strokes back, as workout buddy and final-round partner Brooks Koepka claimed his second U.S.