Thai No 2 and 3 Khosit Phetpradab and Suppanyu Avihingsanon kept the Thai flags flying high in  the Yonex Sunrise Vietnam Open after they survived gritty challenges from their quarter-final opponents on Friday.

Three Thai players led by SEA Games silver medalist Khosit Phetpradab stormed into the quarter-finals of the Yonex Sunrise Vietnam Open following their straight game wins yesterday.