Playing her first event in a month after being shown an early exit from the All England by Canadian Michelle Li in March, the world No 4 showed no signs of rust as she sent packing her 33rd-ranked opponent in just 29 minutes.

The 23-year-old Thai who beat Li Xuerui to become the first Thai singles player to win this tournament will set up a second-round clash with South Korean Lee Jang Mi in round two.

Also joining Ratchanok in the round of 16 was rising star Pornpawee Chochuwong following her upset win over world No 14 Aya Ohori of Japan 21-7 16-21 21-18. She faces eighth seed and two-time Super Series winner He Bingjao of China.

All four Thai women inclduing Nitchaon Jindapol and Busanan Ongbamrungphan were through to the next round. Thai No 2 Nithcon beat Lee Ying Ying of Malaysia 12-21 21-17 21-17 while Busanan beat Goh Jin Wei of Malaysia 18-21 21-15 21-10.

In the men’s singles opening round, only Khosit Phetpradab procceeded into the second round after he beat Hu Yun of Hong Kong 21-14 21-8.

In the mixed doubles, three Thai pairs successfully booked their places in round two. Eighth seed Dechapol Puavaranukroh and Sapsiree Taerattanachai rebounded from the first-set loss to beat Chang Tak Ching and Ng Wing Yunf of Hong Kong 18-21 21-12 21-15.

Tinn Isriyanet and Pacharapun Chochuwong beat Lu Ching Yao and Chiang Kai Hsin of Taiwan 21-11 17-21 21-12 while Nipitphon Phuangphupet and Jongkolphan Kititharakul ousted Danny Chrisnanta and Wong Crystal of Indonesia 21-9 13-21 21-12.

Jongkolphan later teamed up with Rawinda Prajongjai to score her second win of the day with a 21-11 21-9 victory over Xue Sin Gong and Weng Chi Ng of Macau.