Manu, who came into the final round with an overnight lead of five shots seemed to have lost his touch as he carded a 4-over 76 to finish the tournament at 8-under 280.
A fighting Syed Saqib Ahmed brought in a card of one-under par 71 to tie with Manu, which necessitated a play-off.
After both the players squared the first play-off hole (par-5 10th) with a par, Saqib hit his second into the trees in the second play-off hole (Par-5 9th) while Manu was safely near the green in two and promptly made a birdie to clinch the issue.
It was Saqib who called the first shots as he went for the pins from the word 'go' making a birdie on the opening hole. However, it cost him, probably the match, when he made consecutive double bogeys on the third and fourth.
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With three birdies in the next five holes, the Bangalore lad was back in contention at the half-way stage, trailing the Gurgaon-based amateur by a solitary shot after Manu had made two bogeys and a double on his front nine.
"I am thrilled at my victory especially since the field was a strong one. I was a bit lost on my front nine. I did not know whether to attack or defend, hence committed some mistakes," said Manu.