PV Sindhu will start her campaign against Michelle Li, while Kidambi Srikanth will face World No. 2 Chou Tien Chen of Chinese Taipei in the first round.
Heading into the tournament, Saina Nehwal and Sourabh Verma will draw confidence from the fact that they have won the tournament in the past.
This was the third time that HS Prannoy defeated Lin Dan. He had outclassed the Chinese in the Indonesia Open in 2018 and French Open in 2015.
India's star shuttler Kidambi Srikanth came from behind to beat Ireland's Nhat Nguyen 17-21, 21-16, 21-6.
HS Prannoy said people who can push a nomination is more important than performances on court.
Saina Nehwal defeated Thailand's Phittayaporn Chaiwan by 21-17, 21-19 in a match that lasted for 39 minutes.
Kidambi Srikanth's bad run in 2019 continued as he was knocked out in the first round of the Japan Open after losing to H.S. Prannoy on Wednesday.
PV Sindhu ended with a silver medal at the Indonesia Open as top honours continue to elude her 2019.
The giant-killing HS Prannoy is currently ranked 26 in the world.
PV Sindhu took just 39 minutes to record a 21-13, 21-19 win over the world number 22.
Subhankar Dey produced the biggest upset of the first day of the India Open, beating World No.9 and fourth seed Tommy Sugiarto of Indonesia.
Kidambi Srikanth outclassed his French counterpart Brice Leverdez 21-13, 21-11 in straight games.
PV Sindhu skipped the Malaysia Masters after taking part in the Premier Badminton League.
As for Delhi, this was their first victory in six matches in what has been a season to forget.
Mumbai Rockets kickstarted their 2018 Premier Badminton League campaign with a 5-0 win against Delhi Dashers.
PV Sindhu was sent packing by South Korean Sung Ji Hyun.
Kidambi Srikanth brushed aside France's Lucas Corvee in 35 minutes. He will now face Indonesia's Tommy Sugiarto in the next round.
Kidambi Srikanth went down to 19-21, 21-16, 21-18 Lee Dong Keun of South Korea in the quarterfinals of the Japan Open.