The former world number one, Saina got the better of Sindhu, the Olympic and World Championship silver medallist 21-17, 27-25 in a pulsating summit clash that lasted 54 minutes.
With this victory, Prannoy had taken a revenge of his defeat in French Open Super Series 2017 where Srikanth got the better of him in the semi-final match.
In the men's singles event, India's top male shuttler Srikanth dispatched Shubham Prajapati in straight games 21-17 23-21 to advance to the next round.
Srikanth became the first Indian and only fourth men's singles player in the world to win four Super Series titles in a calendar year, said not a few but many players, including him, are capable of winning top tournaments these days.
Mixed doubles pair of Pranaav Jerry Chopra and N Sikki Reddy suffered a 15-21 12-21 loss to fourth-seeded Indonesians Tontowi Ahmad and Liliyana Natsir.
Srikanth, who decimated Korean veteran Lee Hyun II in a lop-sided final on Sunday at Odense, will open his campaign against England's Rajiv Ouseph, who had reached the quarterfinals at Denmark Open last week.
US Open champion HS Prannoy will next face Korea's top seed Son Wan Ho, Srikanth will meet current world champion Viktor Axelsen, while Saina will square off against Japans Akane Yamaguchi.
The 24-year-old will head into Denmark Open as eighth-seed after making two quarterfinal finishes at Glasgow World Championship and Japan Open.
Niharendu Mallick, who had joined SAI's 'Come and Play' course in April, was doing shadow practice on Saturday when he fell unconscious on the floor.
US Open champion H S Prannoy also suffered a 15-21 14-21 loss to China's second seed Shi Yuqi in 45 minutes to crash out in the last-eight stage in Japan Open Super Series.
Chinese Taipei's Tai Tzu Ying retained her top spot. London Olympics bronze winner Saina Nehwal was static at the 12th spot.
Sindhu avenged her World Championship heart-break by beating Nozomi Okuhara in a pulsating summit clash of Korea Open to claim her second super series title of the season.
The World Championship silver-medallist recovered from a mid-game slump to stave off the challenge from World No. 19 Minatsu Mitani of Japan 21-19 16- 21 21-10 in a match that lasted 63 minutes.
The London Olympics quarterfinalist, Kashyap will face Chinese Taipei's Hsu Jen Hao in the main draw of Korea Super Series.
BAI chief said he had a meeting with the senior players and they have voluntarily given their nod to participate in the National Championship.
The national badminton coach further says that they both share a very cordial and friendly relationship, which has been built over time.
PV Sindhu, who lost in the World Badminton Championship final to settle for silver, said overall the tournament has been very satisfying for the Indians.
PV Sindhu, a two-time World Championships bronze medallist, dominated her younger opponent from the beginning, not allowing the reigning world junior champion to settle in.
PV Sindhu, who is a double bronze medalist at World Championships, did not break a sweat in the clash and sailed to an easy victory over her Chinese fifth seed opponent.
Saina Nehwal, seeded 12th, registered a morale-boosting 21-19, 21-15 win over South Korean second seed Sung ji Hyun.
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