Thailand's Boonsak Ponsana bounced back from an opening Group L defeat in the men's badminton singles preliminaries to defeat South Korea's Lee Dong-keun in his second match on Saturday.
Beaten by Denmark's Viktor Axelsen in game one, Ponsana kept his qualification hopes alive with a morale-boosting 21-19, 17-21, 21-16 win over Lee.
The final match to decide the group between Lee and Axelsen takes place on Sunday.
In the women's singles, there was a victory in Group C for Singapore's Liang Xiaoyu, as she beat France's Delphine Lansac 21-7, 21-15.
Next up for Liang is South Korean Sung Ji-hyun on Sunday.
Malaysia's Tee Jing Yi also got her Olympic campaign off on a succesful note as she defeated Kristina Gavnholt of the Czech Republic 22-20, 21-15.
After an opening loss to Nozomi Okuhara, Vu Thi Trang of Vietnam hit back to beat Indonesia's Lindaweni Fitriani 21-12, 21-11.
In men's doubles action, Malaysian duo Tan Wee Kiong and Goh V Shem made it three wins from three in Group B to make sure of their place in the quarter-finals.
The duo secured a great victory over China's Fu Haifeng and Zhang Nan, coming from a game down to prevail 16-21, 21-15, 21-18.
In Group D, Indonesian pair Hendra Setiawan and Mohammad Ahsan suffered their second defeat as they lost 21-15, 21-17 to Chinese duo Chai Biao and Hong Wei.
In the women's doubles, Puttita Supajirakul and Sapsiree Taerattanachai of Thailand secured their first win with a 21-17, 21-15 result over India's Jwala Gutta and Ashwini Ponnappa.
In Group C, there was a victory for Indonesian duo Greysia Polii and Nitya Kirishinda Maheswari over Malaysian pair Woon Khe Wei and Vivian Hoo Kah Mun.
In mixed doubles action, there was another win for Indonesia over Malaysia, as Liliyana Natsir and Tontowi Ahmad defeated Goh Liu Ying and Chan Peng Soon 21-15, 21-11 in Group C.
Elsewhere in Group C, Thailand’s Bodin Isara and Savitree Amitrapai defeat Leanne Choo and Robin Middleton of Australia 2-0.
In Group A, Hong Kong went down 2-0 to China, while Indonesia beat Germany by the same margin.