Adam Schenk maintains lead at Valspar with Spieth and Fleetwood lurking

If Adam Schenk is going to win his first PGA Tour title, he's going to have to hold off a pair of heavyweights to do it.

American Schenk carded a 70 on Saturday to sit at eight-under par at the Valspar Championship at Palm Bay Harbor, Florida, leading compatriot Jordan Spieth and England's Tommy Fleetwood by one stroke.

A trio of US golfers, Taylor Moore, Cody Gribble and Webb Simpson, are tied for fourth, two shots off the lead.

England's Matt Wallace, Patton Kizzire and Wyndham Clark head into Sunday's final round at five-under, clustered together in a share of seventh place.

Schenk has held the lead or co-lead after each round at Innisbrook Resort. He posted three birdies against two bogeys in the third round, but it was enough to remain atop the leaderboard on moving day. He birdied two of his final three holes, including the finishing 18th.

"Battle all day. Not a ton went our way early," Schenk said. "We really hung in there. (My caddie) did a great job of telling me that everybody's going to struggle today, it's windy, it's difficult. You're going to get some bad breaks, you're going to get some good breaks, just wait for 'em. We got ours on 16 and 18. The birdie on 18 was just an added bonus."

Spieth had a strong start to his round in pursuit of a repeat win at the event. He eagled the first but carded four bogeys on the back nine for five total. Five birdies helped negate the bogeys.

"It was a really nice start," Spieth said. "I've kind of not really had my best stuff the last two days with my swing and today I managed it really well around here. I made a few too many mistakes but overall in these conditions I think I would have signed for two-under."

Fleetwood, meanwhile, was one of three players with a bogey-free round