ATLANTIC BEACH, Fla. (AP) — Sam Saunders, Arnold Palmer’s grandson, shot a 12-under 59 on his home course Thursday in the first round of the Tour Championship.

Saunders birdied his final six holes at Atlantic Beach Country Club — the Jacksonville-area club where he became a member this year — for the seventh sub-60 round in Tour history.

With wife Kelly and 8-year-old son Cohen looking on, Saunders made an 18-foot birdie putt on the par-3 eighth and closed with a 10-footer on the par-4 ninth.

“It was dead center. I saw it going in from a few feet out,” he said about the final putt.

Stephan Jaeger set the tour record of 58 last year in the Ellie Mae Classic at TPC Stonebrae in Hayward, California, and Notah Begay III, Doug Dunakey, Jason Gore, Will Wilcox and Russell Knox also shot 59.

“Honestly, I was excited because my wife and my son, Cohen, who is really getting into golf, got to watch,” Saunders said. “He’s only watched me play three full rounds of golf probably. He’s watched me fail in golf a lot, which is good, that’s a good lesson for him. For my wife, Kelly, to be there; she’s watched the ups and downs of this whole deal. I’m really glad that they got to be out there and watch me do that.”

Saunders had 13 birdies and a bogey. Opening on No. 10, he birdied the first three holes and added a birdie on 14. He bogeyed the par-3 15th, taking two shots to get out of a bunker, and birdied 15 and 18 to make the turn in 5 under. He birdied No. 2 and Nos. 4-9 for a 7-under 28 on his final nine.

On the par-3 fifth, the 30-year-old former Clemson player holed a 40-footer from well over the green with a shaved bank and pond looming beyond the hole.

“You’re dead. You’ve got no shot there,” Saunders said. “I putted it up the hill and it was going Mach 1, it would’ve been 30 feet past the hole and it hit dead center.”I was just hoping for it to hit the pin….