Robby Shelton of Wilmer, Ala., shot a course-record 8-under 64 on Thursday to take the third-round lead in the Junior PGA Championship, and defending champion Ariya Jutanugarn of Thailand dropped into a tie for the top spot in the girls' division.
The 16-year-old Shelton had an eagle, seven birdies and a bogey — on the par-4 18th — at Sycamore Hills to reach 11 under.
"It was very special today, one of those days where nothing can go wrong," Shelton said. "I was striping it, putting well and just knew when I started that things were going to turn out well.
"I have been in these situations before, though not quite as big as this. I am in a groove right now and hopefully I can carry that through to tomorrow."
Cameron Champ of Sacramento, Calif., was a stroke back after a 67.
"I have been hitting the ball really well all week and it's helped my confidence," the 17-year-old Champ said. "I started off great again. I birdied two out of my first four holes, so it was a great way to start the round. ... I knew I had to play well to get to the top of the leader board and I was able to do that. "I thought if I got myself somewhere close today and in contention I could really do something tomorrow."
The 16-year-old Jutanugarn, a 10-stroke winner last year, had a 71 to match 15-year-old Samantha Wagner of Windermere, Fla., at 9 under.
"I could not hit my driver and my irons were bad too," said Jutanugarn, two strokes ahead entering the round. "My putting was so good, but I did not have chances."
Wagner shot a 69.
"Everything was working well today. I was making putts, I was chipping well, I was hitting fairways and greens," Wagner said. Ariya struggled a little bit, but we both shot under par."
Jutanugarn's older sister, Moriya, was two strokes back along with Alison Lee of Valencia, Calif. Moriya Jutanugarn had a 68, and Lee shot a 69.
"It's going to be so fun to play with my sister," Ariya Jutanugarn said about the final round. "I really like Samantha, too, so I am looking forward to it."
Wagner also was looking forward to final threesome.
"It's going to be a lot of fun out there tomorrow," Wagner said. "We are all really good friends and Ariya and I had a great time today."
The top 30 boys and top 31 girls made the cuts for the final round Friday.