South Africa's Ockie Strydom carded a 63, equalling the course record at Leopard Creek, to move into a share of the lead at 15-under.
He looked set to beat the record after firing eight birdies and an eagle over the first fifteen holes but a bogey at the par-3 16th stopped his momentum.
"I'm just doing the same as what I've been doing every day.
"Play golf - if it comes out, it comes out. If it doesn't, you've still got next week to go."
Ockie Strydom ties the course record and leads in the clubhouse at -15 ✍️#DunhillChamps
— DP World Tour (@DPWorldTour) December 10, 2022
Overnight leader Scott Jamieson closed with a 70 to retain a share of the lead.
"It was a solid day," said the Scot. "As expected, the course was a little tougher today, the green speeds were up a little bit on yesterday.
"I didn't get off to the best of starts on the front nine, I hit poor shots on the fourth and fifth which kind of killed the momentum.
"Then you get seven and eight - two really tough holes.
"One over at the turn wasn't a disaster, I knew there was going to be chances on the back nine - and I hit three in a row on the back nine.
"So yeah, two under was a good day."
South Africans Oliver Bekker and Dean Burmester both carded 68s for a share of third place at 13-under alongside England's Dale Whitnell who shot 66.
Clubhouse views at @LeopardCreekCC 🐘 #DunhillChamps pic.twitter.com/gSuHddR2V0
— DP World Tour (@DPWorldTour) December 10, 2022
