BLAINE, Minn. -- Like that double-deck burger's special sauce or the Colonel's 11 herbs and spices, some things just aren't meant to be known, particularly when it comes to professional golf and the science of it all.
And so it goes that brainy Bryson DeChambeau wouldn't say just what changed Friday during a season of struggle after he shot a career-low 9-under-par 62 that leads the new 3M Open after two rounds by two shots.
"That's secret stuff, man," he said. "I'm not talking to you about that."
DeChambeau has won five times on the PGA Tour by the tender age of 25 -- four times in 2018 alone -- with a reliance on his working knowledge of air density and a repeatable single-plane swing. But the same guy who seemingly couldn't lose during last year's FedExCup Playoffs hasn't won in 2019.
His eighth-place tie two weeks ago at the Travelers Championship in Cromwell, Conn., was his best finish since he placed seventh at the limited-field, year-opening Sentry Tournament of Champions in Hawaii. In between, he missed three consecutive cuts, including May's PGA Championship, and finished T-22 in the Memorial Tournament and T-35 in the U.S. Open at Pebble Beach.
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And now after his bogey-free second round at TPC Twin Cities in Blaine, he leads Canadian Adam Hadwin by those two shots, first-round leader Scott Piercy, Sam Saunders, Brian Harman and Sam Burns by four shots and four others, including Monday qualifier Arjun Atwal, by five.
At age 60, course co-designer and re-designer Tom Lehman followed Thursday's 67 with a 69 and at 6-under is tied for 35th, eight shots off the lead.
"The idea of even being near the lead is a little bit hard to imagine with the quality of these players," Lehman said. "I'm tired. It's a long course, a lot of hard swings for me."
While 85 players made Friday's cut, superstar Phil Mickelson missed it by eight shots after shooting 74-73. There will be another cut (70 players and ties) after Saturday's round.