Adam Schenk remains atop the standings at the Valspar Championships after three rounds but Jordan Spieth and Tommy Fleetwood are both within striking distance one stroke behind.

The 31-year-old American, who has never won on the PGA Tour, was joint-leader after the first round and outright leader at the halfway mark, maintaining that through the third day in windy conditions on Saturday at the Copperhead Course in Florida.

Schenk carded a third-round one-under 70 that included two bogeys and three birdies. The American birdied the par-five 18th after hitting his approach within five feet to re-claim his lead, sitting eight under after three rounds.

Spieth had an eventful round that started with an eagle on the par-five first hole, but finished with a bogey on the 18th.

The 29-year-old American missed a five-foot par putt on the seventh, along with a seven-foot par putt on the 10th, while he managed birdie on the 11th after a bunker shot and had a three-putt bogey on the 13th.

The three-time major winner's two-under 69 round included an eagle, five birdies and five bogeys, having led by two strokes at one stage.

Former US Open and Open Championship runner-up Fleetwood also carded a two-under 69 to be seven-under overall. The Englishman's round was more routine compared to Spieth, with 16 pars and two birdies.

Webb Simpson, Taylor Moore and Cody Gribble are all tied at six-under overall, while Patton Kizzire made the major move up the leaderboard with a four-under 67 to be five-under overall.

Kizzire moved up 19 places overall for the round, enjoying a bogey-free round with four birdies. Justin Thomas dropped down the leaderboard after a one-over 72 to be two-under overall.