Saina Nehwal suffered a shock 21-19 13-21 5-21 loss to Sayaka Takahashi while Kidambi Srikanth went down to Shesar Hiren Rhustavito 21-18 12-21 14-21.
Third seed Srikanth continued to struggle as his run was cut short by former world no. 1 Son Wan Ho.
Third seed Srikanth, who had lifted the title in 2016, eked out a thrilling 18-21 22-20 21-16 win over compatriot Parupalli Kashyap, who is also a former two-time champion here.
Indian star shuttler Kidambi Srikanth has pulled out of the Premier Badminton League to concentrate on international tournaments.
The 26-year-old from Guntur, who had guided Bangalore Raptors to their maiden title win in the last PBL, will not feature in the fifth edition scheduled to be held from January 20 to February 9.
Kidambi Srikanth lost to Japan's Kanta Tsuneyama 14-21, 19-21 while South Korea's Kim Donghun got the better of Sameer Verma 21-19, 21-12.
After going through a tough phase since his final finish at India Open this year, Srikanth boosted his confidence with a semifinal appearance at the Hong Kong Open last week.
Srikanth, who was trailing 3-11 at mid-break in the first game, lost the first contest 9-21.
Unseeded Srikanth, ranked 13th in the world, was leading by a game when Long decided to concede the match, thus handing the Indian a place in the last four of the HSBC BWF World Tour Super 500 event.
Kidambi Srikanth defeated Sourabh Verma 21-11 15-21 21-19 while H.S. Prannoy lost to Jonatan Christie 12-21, 19-21.
Sai Praneeth, who had won bronze at the World Championships in August, moved to top 10 while Srikanth, who was at 10th in the previous week, dropped out of the top bracket.
Srikanth was to play against Momota in the first round on Wednesday but the Japanese world number one pulled out of the tournament on Tuesday. The reasons for his withdrawal were not known.
Former world number one Srikanth was pitted against reigning two-time world championship and numero uno ranked Kento Momota of Japan in his opening round but he pulled out of the tournament.
Indian shuttlers Kidambi Srikanth and Parupalli Kashyap faced defeats in the first round of the French Open.
Former champion Kidambi Srikanth lost to fourth seed Anders Antonsen of Denmark 14-21 18-21 in the match that lasted 43 minutes.
Srikanth lost 14-21, 13-21 against Kantaphon Wangcharoen of Thailand in the pre-quarterfinal match while Prannoy's campaign ended with a loss at the hands of world no. 1 Momota.
Former World No 1 Srikanth, who has not won a title at the BWF World Tour in the last 22 months, stave off a spirited a challenge from Ireland's Nhat Nguyen 17-21, 21-16, 21-6 in a match that lasted an hour and six minutes.
Nehwal, who withdrew from Indonesia Open and Japan Open due to injuries, registered a straight-game win over Phittayaporn Chaiwan of Thailand.
It was compatriot HS Prannoy who defeated Srikanth 13-21, 21-11, 22-20 in a match that lasted for an hour.
The Indian shuttlers registered victories in their first round-ties at the BWF World Tour Super 1000 tournament.
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