Tokyo, Sep 10: World No.1 Saina Nehwal suffered a thumping straight games defeat against Japanese Minatsu Mitani in the women's singles pre-quarterfinals of the $275,000 Japan Open Superseries here on Thursday.

Mitani trumped second seed and Olympic bronze medallist Saina 21-13, 21-16 in 40 minutes to end India's competition in the category. PV Sindhu had lost on Wednesday.

In the men's singles second round match, HS Prannoy endured a tame 9-21, 16-21 loss in 43 minutes against Leo Dong Keun of South Korea.

IANS