Dechapol Puavaranukroh and Sapsiree Taerattanachai advanced to the mixed doubles final at the US$850,000 BWF Denmark Open in Odense on Saturday.
The Thai second seeds rallied to defeat third seeds and 2019 champions Praveen Jordan and Melati Oktavianti of Indonesia 16-21, 21-17, 22-20 in the thrilling semi-final of the World Tour Super 1000 event at Odense Sports Park.
The battle was very close as Dechapol and Sapsiree won a total of 59 points while the Indonesian pair took 58 in the 65-minute contest.
It was also the first time the Thai pair dropped a game this week.
Dechapol and Sapsiree will face Yuta Watanabe and Arisa Higashino in today's decider after the Japanese fourth seeds stunned top seeds Wang Yilyu and Huang Dongping of China 16-21, 21-17, 21-17.
Fifth seeds Jongkolphan Kititharakul and Rawinda Prajongjai, the other Thai players in the tournament, were due to play China's Huang Dongping and Zheng Yu in the women's doubles semi-final.
Akane Yamaguchi will vie for the women's singles title after the Japanese second seed secured her place in the final with a tough 23-21, 22-20 victory over sixth seed He Bingjiao of China.
She will face fifth seed An Se-Young of South Korea in the title match.
The Korean rising star fought back after losing the first game to defeat Kirsty Gilmour of Scotland 21-13, 12-21, 21-16.
Yamaguchi won the title in 2016, the same year former Thai No.1 Tanongsak Saensomboonsuk won the men's singles crown.
Ratchanok Intanon, who got knocked out in the first round by fellow Thai Phittayaporn Chaiwan, won the women's singles title in 2017.