The American, 37, converted a 20ft birdie putt on the final hole for the PGA Tour's first 59 in 2018.
The 10th sub-60 round on the PGA Tour belonged to Snedeker on the opening day at Sedgefield Country Club, although he did not get off to a great start as he bogeyed the 10th before he bounced back with four straight birdies. He played the front nine in 27, including an eagle 2 on the par-4 sixth hole when he holed out from 176 yards.
"When the 5-iron got close on seven, I was like 'Okay, you got to do it - it's not going to get any easier than this, '" he added.
"I better be smiling", Snedeker said.
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"I was pretty upset [after the eighth] because I knew you're not going to have many good looks to shoot 59", Snedeker told PGA Tour Live.
Ryder Cup captain Jim Furyk holds the record for the lowest score on the PGA Tour with a 58 in the Travelers Championship in 2016. It was really special to know I'm part of a small club on tour.
"Nobody could see this coming - trust me", Snedeker said.
But at the par-4 eighth, Snedeker missed a six-foot birdie putt and tapped in for par.
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Silverman, of Thornhill, Ont, spent most of PGA Championship week last week with his young family, going to Florida to register a vehicle he won after a closest-to-the-pin contest at the Waste Management Phoenix Open earlier this year.
Furyk also shot 59 in the BMW Championship in 2013.
Fourteen years after Geiberger's groundbreaking 59, Beck recorded the second in the third round at the Sunrise Golf Club. The Raleigh native and former Wake Forest player who won this tournament in 2011 enters as the highest-ranked player in the field at No. 12 on the points list.
Just three weeks after Goydos became the fourth player to break 60, Appleby became the fifth as the Australian emulated Duval and carded a final-round 59 to clinch a one-shot win over Jeff Overton.
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"Ended up being a good thing looking back", said the eight-times PGA Tour victor. "This means absolutely nothing in the grand scheme of this golf tournament".