HILTON HEAD ISLAND, S.C. >> U.S. Open champion Matt Fitzpatrick shot his best round on the PGA Tour with a 63 Saturday for a one-shot lead over Patrick Cantlay through three rounds at the RBC Heritage.

Fitzpatrick had six birdies and an eagle when he holed out from 149 yards away on the par-4 third hole. He was at 14-under 199, poised for his first tour win since that major title 10 months ago.

“For me, that’s ideally the start you need on a Saturday, isn’t it?” Fitzpatrick said of the unexpected hole out. “It just gets you off to a good start.”

Cantlay, who lost in a playoff to Jordan Spieth a year ago, shot 66 to move to 13 under and into position for another try at the plaid, tartan winner’s jacket.

Spieth was also again in the hunt, another stroke back after a 66. He’s seeking to do something he hasn’t in his career — defend a title.

World No. 2 Scottie Scheffler and second-round leader Jimmy Walker were among five players tied at 11 under. Scheffler shot 69 and Walker 72.

Walker, who opened 65-65, reached 14 under and was tied with Fitzpatrick before blowing up with three bogeys on the back nine and falling back.

Walker missed a par putt inside 2 feet on the 11th to fall out of first. Then, his tee shot on the par-3 14th caromed off a wood piling and way off the green, leading to a second bogey.

On the par-5, 15th, Walker’s second shot appeared to stay in one of that tall, stately trees that front the green, or at least there was no video evidence his ball splashed into the water hazard alongside. Walker took a one-stroke penalty and had a third bogey in a five-hole stretch.

Masters champion Jon Rahm gave spectators who’ve celebrated his second major victory all week something to scream about at Harbour Town when he opened with three straight birdies and closed within three strokes of the lead.

But the feel-good, Rahm-com storyline fell apart on the par-3 fourth when his tee shot stopped on a wood facing short of the water.