The 23-year-old made six birdies in the closing nine holes to chase down Patrick Rodgers and collect his first Tour triumph, a bronze buck trophy and a check for a tournament-record $1,008,000. It's pretty special to play in an Open Championship, the home of golf pretty much, where golf started in that area.
With countless fans cheering on the best golfers in the world at the John Deere Classic, getting fans up to date on Twitter and Facebook is an important issue.
Rodgers, who entered the day as the leader, finished alone in second place at 17 under.
But on the PGA tour - he hasn't played since the US Open at Erin Hills, where he finished tied for 16th.
The young American first hit the golfing headlines when he claimed victory at the 2015 U.S. Amateur, but it was the unusal golf clubs he used that really made him stand out from the crowd.
World No 1 So Yeon Ryu tied for third, four shots behind the victor, with fellow Korean Mi Jung Hur.
Standing in the 18 fairway playing three groups ahead of Rodgers, DeChambeau admitted that he didn't intend to hit his approach shot so close to the back left pin, positioned dangerously close to the water guarding the final green. He finished with a 73 that included only two birdies. Twenty under would have done it.
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Miguel Angel Jimenez was fourth on 16-under while Colin Montgomerie closed with a 68 to finish joint-sixth on 11-under. "I was hoping to do some plus-4s on tour; I just didn't want to do it too early and have people go, 'Who is this guy?" At TPC Deere Run he's a cumulative 168-under since 2000 with a win and now seven top-10 results. "When I won the U.S. Amateur I thought I was going, until I turned professional, and that kind of thwarted it a little bit", he said.
Soak this one in, Bryson. "I've just been working so hard my whole life to try to do this".
The Victorian was the highest placed Australian after finishing with rounds of 69, 69, 66 and 67 for a 13-under total.
The effort leaves Gunn sitting 21st on the money-list as he battles to secure a PGA Tour spot alongside Russell Knox and Martin Laird.
That's no longer an issue for the 23-year-old, who is now exempt on Tour through the 2018-19 season. He'll be making his first appearance at the Open Championship next week, and just his third start in a major in his career.
Scott McCarron shot a bogey-free 6-under 66 on Sunday and took advantage of an uncharacteristic crash by three-time defending champion Bernhard Langer to win the Constellation Senior Players Championship in Owings Mills, Maryland.