Sindhu, a 2017 champion and 2016 finalist, edged out Denmark's eighth seed Mia Blichfeldt 21-19, 22-20 in a closely-fought contest to set up a clash with China's He Bingjiao.
Praneeth, who had reached the finals at Swiss Open early this month, eked out a thrilling come-from-behind 18-21, 21-16, 21-15 win over fifth-seeded compatriot Sameer Verma.
Defending champion Saina hardly broke a sweat to get the better of former India number one Neha Pandit of Mumbai 21-10, 21-10 in a lop-sided quarterfinal contest.
Saina is the only Indian in women's singles event and will next play another unseeded shuttler from Hong Kong's Pui Yin Yip in the second round.
The beautiful couple chose colour-coordinated and traditional outfits from celebrity designer Sabyasachi Mukherjee for the special night.
Saina posted pictures with husband Kashyap on her Twitter account.
Saina will next face eighth-seeded compatriot, Rituparna Das, while Kashyap will take on Thailand's Sitthikom Thammasin in quarterfinals.
Kumar has been instrumental in helping Saina achieve World No. 1 ranking in April 2015 and win a silver at the World Championship.
From the past few years the love affair of Saina and Kashyap has been the talk of the town and the good news will surely bring a smile on the faces of their fans.
Kashyap, a former National champion and second seed, saw off Cheam 23-21 21-14 in a 37-minute clash.
Coming back after recovering from a shoulder injury, Sameer also dished out an attacking game to see off former World No. 3 and 2014 World Championship bronze medallist Tommy Sugiarto in three games.
Kashyap notched up twin wins in the qualifying round to reach the men's singles main draw.
Satwik and Ponnappa managed to earn two crucial wins to join Pranaav Jerry Chopra and N Sikki Reddy in the main draw of mixed doubles of Denmark Open.
Kashyap first got past Denmark's Emil Holst 21-15, 21-14 but lost to Japanese Yu Igarashi 11-21, 21-18, 14-21 in an hour and five minutes in the second qualifying match.
Rio Olympic silver medallist Sindhu opened her campaign by beating Hong Kong's Cheung Ngan Yi 21-13, 21-8 in 34 minutes.
The London Olympics quarterfinalist, Kashyap will face Chinese Taipei's Hsu Jen Hao in the main draw of Korea Super Series.
Despite going through a string of injuries, Prannoy had shown what he is capable of when he faced Prannoy while the match lasted for One hour and 5 minutes in Anaheim, California.
HS Prannoy dished out a gritty performance to defeat countryman Parupalli Kashyap 21-15, 20-22, 21-12 in the summit clash.
It will be the second time this season that two Indians will fight it out for the title at international badminton when K Srikanth and B Sai Praneeth had played in the finals of Singapore Open with the latter claiming his maiden Super Series title.
The Indian pair will now face a tough challenge when they take on top seeds Lu Ching Yao and Yang Po Han of Chinese Taipei later today.
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