Sindhu was in supreme form and maintained a lead right from the start.
Sindhu dominated the game from the beginning, ending the game in less than 40 minutes. In 2016 Summer Olympics, she won the silver medal in the women's singles event.
Sindhu will be up against sixth seed Ratchanok Intanon of Thailand, who earlier beat Canada's Michelle Li 21-14, 21-16, in the semi-finals.
Sindhu's wins came in India Open 2013 and Korea Open 2015.
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It would not be an easy target for the Indian shuttler to defeat former world no. 1 Intanon who enjoys an upper hand over Sindhu. It is a fine win considering the Japanese was seeded number five. In the next round, Nehwal will face Chen Yufei of China while Sindhu will face Aya Ohori of Japan.
Second seeded PV Sindhu completely outplayed world no. 3 Yamaguchi and took only 37 minutes to beat her in the quarters.
Among the three, it was the US Open champion HS Prannoy who had to work the hardest to secure his 19-21, 21-17, 21-15 win over the 24th ranked Hu Yun. Also, this will be their first meeting this year. The players met for the first time.
However, Parupalli Kashyap squandered an opening game advantage to go down narrowly 21-15, 9-21, 20-22 to Korean Lee Dong Keun, while Sourabh Verma failed to put up a fight against Indonesia's Tommy Sugiarto, losing 15-21, 8-21 to bow out of the competition.