Rai, a former Asian Tour winner, had seven birdies against three bogeys as he finished at 10-under par 278 for the week. Rai shot rounds of 70, 71, 69 and 68.
Rai began with a hat-trick of birdies and then added further birdies on sixth, 10th, 13th and 17th. He dropped shots on fifth, seventh and 11th.
Michael Tran of Vietnam sensationally won his maiden Asian Development Tour (ADT) title after defeating overnight co-leader Lam Chih Bing of Singapore on the first play-off hole.
The duo were tied on 18-under-par 270 total in regulation play before returning to the par-five 18th for the play-off battle where Tran outplayed Lam with a birdie against a par at the Damai Indah Golf, BSD course.
Thailand's Sutijet Kooratanapisan, who held a share of the overnight lead, settled one shot back in third place with American Jarin Todd after signing for rounds of 70 and 68 respectively while Panuwat Muenlek, also of Thailand, took fifth place on his own on 273 following a 71.
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