Ratchanok Intanon ended her title drought with her second Thailand Open crown at Nimibutr Stadium on Sunday.
The 22-year-old top seed again proved her superiority over Busanan Ongbamrungphan, claiming a tough 21-18, 12-21, 21-16 win in an 84-minute final of the US$120,000 Grand Prix Gold tournament.
Ratchanok also beat Busanan to become the first Thai women's champion at the national open in 2013.
Ratchanok's last victory came at the 2016 Singapore Open, her third successive Superseries win after the India Open and the Malaysia Open, nearly 14 months ago.
Having failed to defend her three Superseries titles in April, this victory should be a big boost for Ratchanok's confidence as she now turns her focus to the $1 million Indonesia Open Superseries Premier event next week.
Meanwhile, Busanan, who had to settle for a runner-up spot for the third time, should take heart from her impressive performance that proved the 21-year-old is edging closer to the world's top 10.
Busanan was also beaten in last year's final by Japan's Aya Ohari.
Chayanit Chaladchalam and Phataimas Muenwong's bid to keep the women's doubles title in Thailand failed at the final hurdle as they lost to Greysia Polii and Apriyani Rahayu of Indonesia.
The fifth-seeded pair, cheered on by a relatively small but vocal group of Indonesian fans at Nimibutr Stadium yesterday, won the title match 21-12, 21-12.
Berry Angriawan and Hardianto Hardianto completed a double for Indonesia when they beat Raphael Beck and Peter Kaesbauer 21-16, 21-16 to win the men's doubles crown.
Third seed Sai Praneeth of India then ended Indonesia's hopes of a treble when he came from behind to beat fourth seed Jonatan Christie 17-21, 21-18, 21-19 in the men's singles final.
In the mixed doubles decider, unseeded He Jiting and Du Yue of China took home the title with a 21-13, 16-21, 21-12 win over fifth seeds Goh Soon Huat and Shevon Jemie Lai of Malaysia.
The tournament will be upgraded to a top-tier Superseries next year.
Thai shuttlers will now prepare for the $1 million Indonesia Open, which will be held in Jakarta between June 12-18.
Ratchanok, seeded eighth in Jakarta, will have a tough opening match against Saina Nehwal. The unseeded Indian lost to Busanan in the semi-finals on Saturday.
Nitchaon Jindapol will face Kim Hye-Min of South Korea, Busanan will meet a qualifier, while Pornpawee Chochuwong will have a tough opener against fourth seed PV Sindhu of India.
Tanongsak Saensomboonsuk will meet Rajiv Ouseph of England in the first round of the men's singles.