World champion Ratchanok Intanon beat China's Hui Xirui 21-16, 21-10 to reach the quarter-finals of the China Open in Shanghai on Thursday.
The teenage Thai, who won her world title in Guangzhou in August, needed only 35 minutes to finish off her unseeded Chinese opponent.
Porntip Buranaprasertsuk also advaned to the last eight of the women's singles with a comfortable 21-13, 21-15 win against Japan's Sayaka Takahashi.
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