Supanida Katethong advanced to the last-16 round of the US$210,000 Princess Sirivannavari Thailand Masters at Nimibutr Stadium yesterday.
The Thai star defeated Insyirah Khan of Singapore 21-10, 14-21, 21-15 to set up a women's singles last-16 clash with compatriot Pitchamon Opatniputh today.
Pitchamon defeated Lauren Lam of the United States 27-25, 21-17 in the first round.
Four Thai men's doubles pairs also progressed to the last 16 of the BWF World Tour Super 300 event yesterday.
They are Nanthakarn Yordphaisong and Chaloempon Charoenkitamorn, Tanadon Punpanich and Wachirawit Sothon, Weeraphat Phakjarung and Wongsathon Thongkham and Peeratchai Sukphun and Pakkapon Teeraratsakul.
Nanthakarn and Chaloempon caused an upset by knocking out fifth seeds He Jiting and Zhou Haodong of China 17-21, 22-20, 21-16 in one hour and 14 minutes.
"We're so happy to make it to the second round," said Nanthakarn. "We lost the first game as we made too many errors but we improved in the second and third games and played better and won the match.
"We will play an Indonesian team [Muhammad Rayhan Nur Fadillah and Rahmat Hidayat] in the second round. We played them once before and lost. But this time we will have the crowd cheering us on and we will try to do our best."
Peeratchai Sukphun and Pakkapon Teeraratsakul defeated Chen Boyang and Liu Yi, another Chinese pair, 21-17, 21-16.
However, Thai men's singles hopes Kantaphon Wangcharoen and Sitthikom Thammasin both bowed out in the first round yesterday.
Kantaphon went down to Cheam June Wei of Malaysia 21-18, 21-17 while Sitthikom was beaten by Anders Antonsen of Denmark 21-15, 21-19.
In other men's singles first round matches, Shi Yuqi of China rallied to defeat Mark Caljouw of the Netherlands 20-22, 21-8, 21-16; Christian Adinata edged past fellow Indonesian Tommy Sugiarto 9-21, 22-20, 21-17; and Koki Watanabe of Japan knocked out seventh seed Brian Yang of Canada 21-19, 21-15.