Mane (69) shot a 3-under card despite missing a lot of birdie chances, and is now trailing the leader by five shots.
Gaganjeet Bhullar (69) kept up his consistent scoring and is now eighth at 11-under, while Khalin Joshi (71) was tied-9th at 10-under.
Chiragh Kumar (74), who just about managed to make the cut along with amateur Kevin Akbar (73) were part of the top 65.
Mane, who shot 67-68 in his first two rounds before a 69 on Saturday, is in serious contention for the first time on an Asian Tour event. He was solid on his back nine where he scored three birdies.
Mane said, I wasn't too satisfied with my putting today. There were two or three putts within four feet but they just didn't go in. I hit the putts well but they were on the firm side, which ended with a similar length coming back! All in all, I held my nerve. I was nervous in the beginning as it was the first time I am in this position on this Tour.
I was playing with legends like Chapchai Nirat, who gave me a short game exhibition. It was a great learning experience for me. I'm just happy to be in striking distance.
On his way to keep calm, he added, I just breathe (to overcame nervousness). I focused on my breathing, which helps. For tomorrow, I'll just do what I do and not let anything escape me.
Harding hit every single green in regulation and missed only one fairway enroute to a 17-under-par 199 total at the Pondok Indah Golf Course.
Zimbabwean Vincent kept up the chase as he signed for a 66. Sihwan Kim will be in the final group with Harding and Vincent, after carding a 67 to be sole third.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)