Top seeds in the men's and women's singles at the 2020 Badminton World Federation (BWF) World Tour Finals, Denmark's Viktor Axelsen and Carolina Marín of Spain, have won in their opening matches in Bangkok.
Axelsen continued his good run, following his two Thailand Open title victories so far this month, after defeating Indonesia's Anthony Sinisuka Ginting 21-17, 21-8.
His compatriot and second seed Anders Antonsen came from a game down to defeat India's Kidambi Srikanth 15-21, 21-16, 21-18.
Chinese Taipei's third and fourth seeds Chou Tien Chen and Wang Tzu Wei also secured 21-16, 12-21, 21-11 and 21-10, 21-14 victories against Malaysia's Lee Zii Jia and Hong Kong's Angus Ng Ka Long respectively.
In the women's singles, Marín won in straight games against Russia's Eygeniya Kosetskaya 21-19, 21-14, with the Olympic champion also looking to win her third straight tournament in Bangkok.
Second seed Tai Tzu Ying of Chinese Taipei won in three games 19-21, 21-12, 21-17 against India's PV Sindhu while fourth seed An Se-young of South Korea was a comfortable 21-12, 21-17 winner against Canada's Michelle Li.
The big shock of day one was Ratchanok Intanon's 15-21, 21-11, 21-18 loss to her Thai compatriot, Pornpawee Chochuwong.
In the men's doubles, top seeds Lee Yang and Wang Chi-Lin of Chinese Taipei defeated fourth seeds Ong Yew Sin and Teo Ee Yi of Malaysia 21-18, 24-22.
Second seeds Aaron Chia and Soh Wooi Yik of Malaysia also won their opening match against South Korea's Choi Solgyu and Seo Seung-jae 21-14, 21-19 while Ben Lane and Sean Vendy won the all-English tie against Marcus Ellis and Chris Langridge 22-20, 21-15.
Third seeds Mohammad Ahsan and Hendra Setiawan of Indonesia were victorious in three games against the Russian pair of Vladimir Ivanov and Ivan Sozonov by a score of 21-18, 15-21, 21-17.
Top seeds in the women's doubles, Greysia Polii and Apriyani Rahayu of Indonesia took 94 minutes to defeat third seeds from South Korea, Lee So-hee and Shin Seung-chan in a 21-17, 22-24, 21-15 win.
South Korean second seeds Kim So-yeong and Kong Hee-yong also won against Germans Linda Efler and Isabel Herttrich 21-11, 19-21, 21-11, while Chow Mei Kuan and Lee Meng Yean won in an all-Malaysian match against Vivian Hoo and Yap Cheng Wen 21-16, 10-21, 21-15.
Jongkolphan Kititharakul and Rawinda Prajongjai of Thailand comprehensively defeated fourth seeds Chloe Birch and Lauren Smith of England 21-10, 21-11.
Marcus Ellis and Lauren Smith suffered two defeats on the opening day, with the top mixed doubles seeds ending up on the wrong side of a thrashing against South Korea's Seo Seung-jae and Chae Yujung, losing 21-12, 21-12.
Second seeds Mark Lamsfuss and Isabel Herttrich of Germany were also handed a defeat against Malaysia's Goh Soon Huat and Lai Shevon Jemie 14-21, 21-18, 21-18.
Third seeds Dechapol Puavaranukroh and Sapsiree Taerattanachai of Thailand defeated Indonesia's Praveen Jordan and Melati Daeva Oktavianti 21-13, 16-21, 21-11, while fourth seeds Thom Gicquel and Delphine Delrue of France won 14-21, 21-14, 21-17 in three games against Hafiz Faizal and Gloria Emanuelle Widjaja of Indonesia.
Tomorrow's action sees the second round of group matches scheduled.