Atwal had rounds of 70, 70, 66 and 71 to total three-under 277.
Gaganjeet Bhullar (71) was even par 280 and Tied-45th, while Shiv Kapur, who was Tied-14th overnight had a nightmarish final round with three double bogeys for a round of a 77 and a total of two-over 282 to finish Tied-54th.
Australian Sam Brazel enjoyed a life-changing victory at the season-ending event, sinking an eight-foot birdie on the last hole for a dramatic win.
Brazel, who earned USD 330,330 and finished seventh on the final Asian Tour Order of Merit, pipped playing partner and Ryder Cup star Rafa Cabrera Bello, who missed a long birdie attempt at the closing hole in the USD 2 million tournament sanctioned by the Asian Tour, European Tour and Hong Kong Golf Association.
Andrew Dodt of Australia and England's Tommy Fleetwood, who were in the thick of battle on a glorious Sunday afternoon, shared third place on 269 after a 68 and 66 respectively while Malaysia's Danny Chia emerged as the top Asian in tied eighth place after a closing 67.
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