Gangjee rose from overnight tied 13th to tied ninth and was the best among the Indians at the Santiburi Golf and Country Club. After the fourth place at the Championships at Laguna in Singapore, this was Gangjee's second successive top-10 finish and he stays fourth on Asian Tour Order of Merit, which is led by Anirban Lahiri.
Manav Jaini, the best placed Indian overnight stumbled on the front nine with four bogeys and a double bogey and could manage only one birdie on the back nine to shoot a round of 76 and slip to tied 28th, down from seventh.
The 47-year-old Thaworn holed a five-foot birdie putt on the closing hole to pip overnight leader Poom Saksansin with a final round of five-under-par 66 to lift the Queen's Cup for the second time in three years.
Jyoti Randhawa (68) was tied 14th with a total of four-under 280, while Rashid Khan (70), Shankar Das (71) and Anirban Lahiri (74) were tied 37th at three-over 287.
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Chiragh Kumar (73) was tied 61st and Digvijay Singh (79) was 67th.
The unorthodox swinging Thaworn surged into a one-shot lead with a birdie on 14 but made life difficult for himself by dropping a bogey on 17 after missing a four-foot par attempt. With Poom, who was wobbly with an outward 39, fighting back with birdies on 16 and 17 to make it a three-way tie going into the final hole, Thaworn's experience came through in the end.