The American, 37, converted a 20ft birdie putt on the final hole for the PGA Tour's first 59 in 2018.

The putt sealed his 10th birdie of the day on a card also featuring one bogey and an eagle, secured when his 176-yard approach on the par-four sixth went in.

The score is a new course record at Sedgefield Country Club in Greensboro.

The world number 88 played his closing nine holes in eight under par. His eagle on the sixth forced organisers to cut a new hole on the green after his ball damaged the cup when it pitched straight in.

Snedeker, an eight-time PGA Tour winner, has not won since the 2016 Farmers Insurance Open, but holds a four-shot lead over compatriots John Oda and Ryan Moore.