The 22-year-old Indian overcame eighth-seeded Okuhara 22-20, 11-21, 20-18 in an hour and 23 minutes final to win the United States dollars 600,000 tournament.
A little more than five months ago, Sameer had defeated Son Wan in the opening round at India Super Series in March but since then the Korean has climbed to the top of world ranking.
This was Sindhu's third SS title.
Sindhu has been in brilliant form since her silver medal triumph in the Rio Olympics after which she run over the then World number 1 Carolina Marin in the Indian Open avenging her Gold loss at the Rio Olympics. Trailing 9-11 Bingjiao's game flourished. Sindhu bounced back to win the third and title.
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PV Sindhu the Champion badminton player is now uttering her best in he career.
It seems Prime Minister Narendra Modi was occupied by the intensity of PV Sindhu's Korea Open finals. Both players showed great spirit and determination.
The Korean Open Super Series women's singles final will be a mouth-watering clash between the two finalists of the World Championships.
Sindhu suddenly hit a bad patch as two wide shots and one of her returns were buried in the net, giving the Chinese a 20-16 advantage.
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Sheer exhaustion forced the Indian on her back as she gasped desperately in an effort to get some air into her oxygen-starved lungs.
Okahura goes into the lead for the first time in the match, as Sindhu miscues a defensive shot to hand the Japanese shuttler an easy smash.
Okuhara had conquered the Hyderabadi in the World Championships final in August in Glasgow.
"It was not an easy match, I was prepared for long rallies".
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But he will be aiming to break a United defence that have conceded just two goals from their first five games this season. Yes, he has pace but he's not physically the strongest. "Defensively we are making too many mistakes".
But, like Sindhu, Ginting also recovered from losing the second set to prevail 21-13, 19-21, 22-20 in 69 minutes.