"I played really nicely. I’m very pleased with my round and in a good spot going into the weekend," he said.
The two-time European Tour winner will head into Saturday on a four-under-par total, chasing down Miguel Angel Jimenez’s nine-under-par lead.
Aiken was set back by a two-over-par 72 on Thursday, but made up for lost time on day two.
"It was really tricky in the rain yesterday, but I’m very pleased with today and hopefully I can build on this," he explained.
On Friday a string of four birdies from the 14th to the 17th formed a solid foundation for the 30-year-old, who started on the back nine. Further gains at the second and seventh made a good round great, and Aiken reached the halfway mark contending rather than scrounging.
The Country Club Johannesburg professional succeeded Jbe Kruger as Avantha Masters champion in March this year, and ranks 34th in the Race to Dubai.
As the season reaches its climax, Aiken is showing his first signs of dominance in months. With the mental boost from his turnaround Friday performance, the coming weekend presents an exciting challenge.
"It’s been two months where I haven’t really done much, missing four cuts by one shot. It’s not that I’ve been playing terribly, but with the competition these days if you don’t sink putts then you’re not going anywhere. Today was better and hopefully I’ll carry this on for the rest of the season," he said.