Prannoy, who lost a fair amount of his time to nagging injuries in his career, dished out a gritty performance to defeat Kashyap 21-15 20-22 21-12 in the summit clash which lasted an hour and five minutes.
"It was a good match, pretty intense match, a high quality match by both me and Kashyap. I think after losing the second game narrowly, I was calm and patient enough and it worked for me," Prannoy told PTI.
"But in the third game, I changed my strategy a bit and I had a good lead. So yeah, overall happy with the tournament. Now I am looking forward to New Zealand Open," he added.
The duo, who had a 1-1 head-to-head record having played each other at the 2014 German Open last time, engaged in fast-paced rallies and Prannoy more often sealed the rallies with his powerful smashes.
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Kashyap clawed back to level par at 15-15 but Prannoy looked unstoppable as he reeled off six straight points to grab the first game with another cross-court smash.
The second game had some intense moments as the duo fought fiercely for each points. The rallies were more aggressive with each having their share of moments.
Kashyap lead 14-9 at one stage but Prannoy drew parity at 15-15. Kashyap continued to exert pressure on his younger colleague and had a 20-18 lead.
In the decider, Prannoy changed his strategy. His deft touch in the lifts and better net strokes earned him points as he zoomed to a 13-7 lead. The 24-year-old continued to move ahead and eventually seal the issue when Kashyap misjudged a shuttle at the baseline.
Ever since bursting on to the scene with a silver medal at the 2010 Youth Olympics, Prannoy has been often left on the sidelines due to injuries, affecting his training and thereby his progress.
He fought through a knee injury in 2011 and back injury in 2012 to reach the finals at the 2013 Tata Open. A series of semifinals at Bitburger, Syed Modi International, Macau and a final at Vietnam was followed by a maiden Grand Prix Gold win at Indonesia in 2014.
He was in rampaging form at the Premier Badminton League this year but injuries to his knee and toe once again came back to haunt him.
But he once again regained fitness and reached the semifinals at Indonesia Super Series Premier, stunning Olympic silver and gold medallist -- Malaysia's Lee Chong Wei and China's Chen Long on the way.
"I have been playing well, if the injuries are off then I am okay, I could not play well in Canada, as I had an inflammation in the tailbone area. Probably that did the damage in Canada," he said.