The 23-year-old Slovak, ranked 367th in the world, got the better of a fighting Xinyun 6-7(5) 6-4 6-4 in a battle lasting nearly 2 hours and 45 minutes at the EMMTC tennis courts.
Jakupovic, who won a double crown here last year, proved that this city was a good hunting ground for her as she overcame dehydration and the heat to dash the dream of her 20 -year-old Chinese rival's maiden title win on the circuit.
In the second, scores were level till 4-4 when Jakupovic broke Xinyun and then held her serve to win the set and draw level.
After a 10-minute break both the players played long rallies before the Chinese was broken in the 9th game again to trail 4-5.
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Jakupovic held her serve to claim her first USD 25,000 event on the circuit.
While the winner received 50 WTA points and prize money of USD 3,919 (Rs 2.5 lakh), the runner-up secured 25 points and prize money of USD 2,091 (Rs 1.25 lakh).
The doubles winners got 50 WTA points and shared USD 1,437 (Rs 93,000), while the runners-up received 25 points and USD 719 (Rs 46,000).