Birmingham: Four Indian male shuttlers, including Olympic hopeful B Sai Praneeth, advanced to the second round but former world no 1 Saina Nehwal was forced to concede her opening women's singles match after suffering an injury at the All England Championships here.
Saina, who finished second best here in 2015, looked in discomfort with her right thigh and decided to retire after lagging 8-21 4-10 behind in her opening round match against seventh seed Mia Blichfeldt of Denmark on Wednesday night.
In men's singles, world no 15 Praneeth saw off France's Toma Junior Popov 21-18 22-20, while HS Prannoy, a former top 10 player, brushed aside Malaysia's Daren Liew 21-10 21-10.
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Sameer Verma also got the better off Brazil's Ygor Coelho 21-11 21-19, while teenager Lakshya Sen stunned Thailand's world no 18 Kantaphon Wangcharoen 21-18 21-12 to make it to the second round.
Prannoy and Praneeth, however, have a tough task at hand as they take on world no 1 Kento Momota and world no 2 Viktor Axelsen in the second round on Thursday.