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The third seed, who got out of hospital on Friday after suffering from flu for four days, wasted two match points at |20-18 in the second game before improving his concentration to dominate the decider and advanced to the quarter-finals. He admitted that he almost withdrew from the tournament because of lack of preparations.

"I just made up my mind to give it a try on Wednesday. I almost fainted during training on Tuesday and tried to eat and sleep well from then on. I felt so much better the next day and didn't want to miss a home tournament,'' said the 2004 champion.

"The doctor said it was a good sign that I could last three games. Actually I was trying to end it in two but I was in a great hurry and I missed some shots,'' said Thailand's main hope who next faces Hong Kong's Chan Yun Lung.

With the victory, Boonsak joined compatriots Thanong-sak Saensomboonsuk and Pakkawat Vilailak in the final eight. Top seed Wong Choong Hann of Malaysia had no problem tackling Rho Ye Wook of South Korea 21-12 21-18 while sixth seed Yun Hu of Hong Kong needed three games to dismiss South Korean Wan Ho-Park 19-21 21-19 21-8.

In the women's singles second round, third seed Salakjit Ponsana was extended to three games before advancing past Japan's Mizuho Muramatsu |21-14 13-21 21-11.

Local Sapsiree Taeratta-nachai upset eighth seed Soo Young-jang of South Korea |21-19 21-9 while another Thai Nitchaon Jindapol advanced with a straight-game 21-12 21-11 win over Hong Kong's Kwan Yi-mong. But local sixth seed Porntip Buranaprasertsuk crashed out at the hands of South Korea's Seung Hee-bae, who prevailed 21-16 21-15.

In the mixed doubles second round, top duo Sudket Prapakamol and Saralee Thoungthongkam easily picked off Ni pitphon Phuangphuapet and Artima Serithammarak 21-15 21-16.