Paisley (65) caught a hot streak on the back nine as well, carding six birdies.
It could have been even better if not for a bogey on No. 13 and a double bogey on the last.
"I'm going to try and run with the momentum from the Nedbank Golf Challenge, be more patient, get things happening and not force anything", Grace said. "But this is a golf course that I've traditionally done pretty well on, and a place that I really love".
Chris Paisley of England got down in two from off the green at the last hole on Saturday to cling to a one-shot lead over local Branden Grace after three rounds of the South African Open.
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Donaldson's ace and Southgate's incredible wedge shot from South African Open, as Grace makes three eagles in the first round. "I thought I hit the ball superbly through 13 holes, but just couldn't get it in the hole".
Paisley, who shared a four-shot overnight lead with Adrien Saddier of France, carded a two-under 70 over the 6,942-metre/7.594-yard layout 12 kilometres (7.5 miles) east of Johannesburg.
And he struggled through his first 10 holes on Saturday in just one-under-par before some inspirational words from his caddie and wife Nieke saw everything click as he collected five birdies in his last eight holes.
But it is Grace who will carry the momentum into the final day following his blistering finish, while compatriot Jacques Blaauw matched the highest-ranked player in the tournament on six-under for the day to take a share of third with Saddier and Chase Koepka.
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Darren Fichardt, another home favourite, made the move of the day in ideal scoring conditions with an eight-under 64 - the best round of the day - to lie four shots off the lead and three ahead of Masters victor Charl Schwartzel, who hit a three-under 69.
"I'm looking forward to Sunday. There are low scores out there, but you just have to avoid the rough".
Retief Goosen and Charl Schwartzel head into the second round on three under, while Ernie Els is at one under.
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