OAKMONT, United States (AFP) - Dustin Johnson rolled in an eight-foot birdie putt at the ninth hole and overtook Shane Lowry atop the US Open leaderboard when the Irishman bogeyed the same hole minutes later at Oakmont on Sunday.
Johnson had two birdies without a bogey on the front nine to move to five-under while Lowry, who started the day with a four-stroke lead on seven-under, had three bogeys on his outward run and another at the 10th to drop to minus-three.
It was a further two strokes back to Spain's Sergio Garcia and American Scott Piercy on two-under.
US veteran Jim Furyk, the 2003 US Open champion and runner-up when Angel Cabrera won the title at Oakmont in 2007, was the clubhouse leader on one-under par after a final-round 66.
South Africa's Branden Grace was one-under through 11 holes.
World number one Jason Day finally got to even par for the tournament with a birdie at the par-five 12th, but the reigning PGA Champion was running out of holes in his quest for a second major crown.
American Andrew Landry, who started the day tied for second with Johnson, endured a nightmare front ninef that included five bogeys and a double bogey.
England's Lee Westwood, who began the day sharing fourth on two-under, fared even worse with six bogeys and a double bogey.