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Treesa Jolly and Gayatri Gopichand staged a comeback to beat Sayaka Hobara and Yui Suizu Japan in a little over an hour to advance to the pre-quarterfinals.
Fritz, assured of breaking into the top 10 after beating Canada's Denis Shapovalov in the semifinals, also won titles in Eastbourne and Indian this year.
The 30-year-old played out of his skin and saved three match points, only to endure the agony of losing it in the end, as Chou emerged victorious in a pulsating contest.
Prannoy saw off eighth-seeded Loh 22-20, 21-19 in a 44-minute clash.
It was Srikanth's first win over his Malaysian opponent Lee Zii Jia in four meetings.
With this win, Kento Momota became the first Japanese player to win the men's singles crown.
National champions Manu and Sumeeth saved a match point in the second game and came back from a 17-19 deficit in the third to upset world No. 10 V Shem and Tan Wee.
Srikanth lost to South Korea's Lee Dong-keun 21-19, 16-21, 18-21 as the Indian challenge came to an end.
Kidambi Srikanth sealed a place in the quarterfinals with a 21-15, 21-14 win over Hong Kong's Wong Wing Ki.
Sindhu suffered her second straight defeat at the hands of Japanese Akane Yamaguchi as she went down 18-21, 15-21 in the women's singles quarterfinals.
Results 1-10 of 15
