She defeated Malvika Bansod in the final.
Sindhu, the top seed, easily pocketed the first game 21-11 before Kosetskaya conceded the second women's singles semifinal match.
Sindhu will face fifth-seeded Russian Evgeniya Kosetskaya in the semifinals.
Sindhu brushed aside Lauren Lam 21-16, 21-13 while Prannoy beat Priyanshu Rajawat 21-11, 16-21, 21-18.
Former world champion, Sindhu will square off against USA's Lauren Lam, who managed to get past a fighting Ira Sharma 15-21 21-16 21-16.
Sourabh suffered a 15-21 21-19 21-18 first-round defeat to Dwicahyo in a match that lasted one hour and seven minutes.
Sourabh Verma went down in straight games to World No. 22 Tzu Wei in the summit clash to miss out on his maiden Super 300 crown.
A gritty Sourabh Verma entered the men's singles final after a hard-fought three-game win over Korea's Heo.
The 26-year-old Sourabh will next face Korea's Heo Kwang Hee for a place in the men's singles final.
Former champion Kidambi Srikanth and Sourabh Verma advanced to the quarterfinals but young Lakshya Sen bowed out of the men's singles contest at the Syed Modi International Badminton tournament here on Thursday.