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Sindhu d a gritty show to bounce back from a game down to outwit Tunjung.
Lakshya, a 2021 World Championships bronze medallist, lost 17-21, 12-21 to Naraoka, a bronze medallist at the 2018 Youth Olympics.
Lakshya Sen advanaced to the quarterfinals with a 21-9, 21-18 win over compatriot H S Prannoy.
Sen beat sixth seed Anthony Sinisuka Ginting of Indonesia 21-16, 21-12.
Playing her first tournament since winning the bronze medal at the Tokyo Olympics in August, Sindhu couldn't match her fifth seeded young Korean rival.
Sameer will lock horns with Tommy Sugiarto in the quarterfinals.
Sindhu won after a struggle against Busanan Ongbamrungphan 21-16, 12-21, 21-15 in 67 minutes in her last 16 match.
London Games bronze medallist, Saina couldn't match Japan's world no. 20 Aya Ohori losing 21-16 21-14 in the opening round.
Sindhu, the reigning world champion, took 30 minutes to get across Yigit, ranked 29th, 21-12 21-10 in her women's singles opener.
Third seed Sindhu lost 17-21, 21-16, 18-21 to Zhang in a hard-fought opening encounter that lasted 56 minutes.
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