Akane Yamaguchi claimed her first title of the year after winning the Princess Sirivannavari Thailand Masters at Indoor Stadium Hua Mark on Sunday.
The third-ranked Japanese, who was the top seed at the tournament, defeated third seed An Se-Young of South Korea 21-16, 22-20 in the 50-minute women's singles final of the BWF World Tour Super 300 event.
Angus Ng Ka Long was crowned the men's singles champion after he beat Yamaguchi's compatriot Kenta Nishimoto in three games.
Ng dropped the first game but launched a fierce comeback to defeat Nishimoto with a 16-21, 21-13, 21-12 scoreline.
The third seed from Hong Kong was a runner-up at the Thailand Open last year, losing to Chou Tien-chen of Taiwan in the championship match.
Nishimoto earned the final berth after he beat 18-year-old Thai rising star Kunlavut Vitidsarn in the semi-finals on Saturday.
The doubles finals were all decided in three games.
Top seeds Chen Qingchen and Jia Yifan fought back to capture the women's doubles title after the Chinese duo beat Baek Ha-Na and Jung Kyung-Eun of South Korea 17-21, 21-17, 21-15.
It was the Chinese pair's second win in four years at the Bangkok tournament following their first victory in 2017.
Marcus Ellis and Lauren Smith of England won the mixed doubles gold medal with a victory over Hafiz Faizal and Gloria Widjaja of Indonesia.
The English sixth seeds overcame a mid-match lapse to take home the title with a 21-16, 13-21, 21-16 victory.
In the men's doubles decider, Ong Yew Sin and Teo Ee Yi of Malaysia rallied to get the better of Huang Kaixiang and Liu Cheng of China 18-21, 21-17, 21-17.