Sindhu, the reigning world champion, beat fourth seeded Blichfeldt 22-20 21-10 in 43 minutes to avenge her first-round loss to the Danish world No.12.
Sindhu took a minute less than an hour to see off a fighting Busanan, seeded fifth, 21-16 23-21 to set up a clash with fourth seed Denmark's fourth seed Mia Blichfeldt.
Indian mixed doubles pair of Satwiksairaj Rankireddy and Ashwini Ponnappa also progressed to the quarterfinals, continuing their recent good run in international badminton.
Sindhu beat Yigit Neslihan of Turkey 21-16 21-19 in her first round match that lasted 42 minutes.
Indian men's singles players, too, have tasted success in this tournament with Sameer Verma, HS Prannoy and Kidambi Srikanth emerging victorious in 2018, 2016 and 2015 respectively
Pullela Gopichand dismissed concerns regarding PV Sindhu's form despite her poor run after winning the 2019 BWF World Championships.
The 2021 All England Open will be the second tournament this year to offer ranking points to qualify for the Tokyo Olympics, after the Swiss Open.
Sindhu, the Olympic silver medallist, notched up a 21-18 21-15 win over world number 13 Pornpawee Chochuwong in her third and final match after suffering defeats in the first two days.
Kidambi lost 21-19, 9-21, 19-21 to Wang Tzu Wei of Chinese Taipei, Sindhu suffered an 18-21, 13-21 loss to Thailand's Ratchanok Intanon.
A week after a demoralising defeat at the Toyota Thailand Open quarterfinals, Sindhu produced a much-improved performance but still lost to Tzu Ying 21-19 12-21 17-21 in a 59-minute match.
Sindhu, who had won the prestigious title in 2018, has been clubbed in Group 'B' alongside top-ranked Tai Tzu Yin.
With the defeat of Sindhu and Sameer, Indian challenge in singles competition ended in the tournament.
Sindhu expectedly outclassed Malaysia's world no. 92 Kisona Selvaduray 21-10 21-12 in a lop-sided second-round contest that lasted just 35 minutes.
World champion Sindhu showed great discipline and focus to see off world no.12 Busanan 21-17 21-13 in the women's singles opener.
The Indian players seemed to struggle with their fitness as none of them could cross the second round at the Yonex Thailand Open, the first event of the Asia leg here.
. The ace Indian shuttler recently returned to the court at the Thailand Open but crashed out in the first round.
This was Sindhu's first tournament since the All England Open in March last year after which the Covid-19 pandemic disrupted the badminton calendar.
While Olympic silver-medallist Sindhu has been training in London for the last two months and would be keen to quickly find her rhythm, Saina was down with COVID-19 and has recently recovered from the dreaded disease.
The Hyderabad-based shuttler also exuded confidence that "in a couple of years, there will be a lot more players who will represent the country and also get medals for the country."
The Indian team, comprising Olympic hopefuls PV Sindhu, Saina Nehwal and B Sai Praneeth, have been allotted training timings.
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