Liang Wen-Chong of China took the sole third spot, two shots behind Bhullar, after returning an eventful three-under 69 in the final round. Aiken recorded the season's lowest 36-hole total and his two-day effort of 15-under 129 bettered the previous best by two strokes.
If Aiken wins on Sunday, it will mark the second victory by a South African of the Avantha Masters, following compatriot Jbe Kruger's success last year.
Also in contention for a good finish at the richest golf event in India is the seasoned Jeev Milkha Singh. The Chandigarh-pro, who signed off tied 43rd last year, looks good enough to better that performance after a three-under 69, comprising six birdies and three bogeys, left him tied 17th with a total of 10-under 206.