Former US PGA champion Dufner fired six birdies and an eagle to leave himself one shot clear of Sweden's Lingmerth heading to the 18th hole.
Other Australians to make the weekend included Matt Griffin (71, two over) and rookie Curtis Luck (70, three over). Kuchar's round was bogey-free until the hard par-3 16th, but he was able to erase it on the 17th hole with a 155-yard approach to eight feet that led to a birdie. He tried to play a flawless shot and barely got it out, then chipped down to wtihtin five feet and missed the putt, making double bogey.
"I have no idea what tomorrow is going to hold, but I feel pretty good about the process and the shots that I'm able to hit right now". Jordan Spieth, Justin Thomas, and Jamie Lovemark are eight-strokes off the lead after two-rounds. I've had a lot of good rounds here.
"It not only helps me with my stroke but also helps with my set-up", he said.
Scott was the best of the Australians on day two but it is Victoria's Marc Leishman who is best placed overall after adding his second consecutive 70 to be 4-under and remain T13. "He wobbled from the get-go, squaring four straight bogeys on holes 2-5, three on failed scrambles and a 3-putt at the fifth from 12'10", before getting on the board with birdie-4 at seven from 5'0".
So, after it looked as if a Dufner had put this tournament to sleep before the weekend began, a real, live competition has broken out at Muirfield, where a Sunday shootout looms.
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Daniel Summerhays is Dufner's closest challenger after he hit three birdies in four holes during a round of 69, although the deficit was extended to five following a bogey on the last.
"I hit a lot of fairways, a lot of greens, which gave me a lot of good opportunities", he said. Spieth started the back nine with two straight birdies, but followed with two straight bogeys.
Ironically, a missed cut at last week's DEAN & DELUCA Invitational at Colonial sent him to Muirfield Village on a high note. I made some nice pars and rolled in some putts, " Dufner said. He had two birdies one day after carding eight.
His second round play was enough to move him 15 places up the leaderboard and at 3-under he is just one shot behind the veteran Leishman.
Johnson was the biggest name to miss the cut, joined by rising Spanish talent Jon Rahm, who bowed out early for just the second time since turning pro past year.
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