Saina reached her first finals in 15 months after prevailing over China's Xuan Deng 21-14 17-21 21-19 while Sindhu surpassed Lindaweni Fanetri from Indonesia 21-6 12-21 21-17 to set up a their first ever international clash against each other at the Babu Banarasi Das Indoor Stadium here.
The two, however, have played at the inaugural Indian Badminton League (IBL) last year where London Olympics bronze medallist Saina got the better of the Sindhu on two occasions.
The women's singles semifinal clash between Saina and Xuan turned out to be a edge-of-the-seat thriller even though 40 ranking places separated the two.
Saina, the top seed, was untouchable in the first game as she kept a distance right from the start to the end even though Xuan kept fighting.
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In the second game, Xuan opened up a slender 6-4 lead early on but Saina swiftly made it 7-7. However, the Chinese gathered five straight points to grab the lead at 15-14 and with Saina succumbing to unforced errors, Xuan roared back into the contest.
A net play gave Xuan a point and the Chinese picked up two more point, catching Saina at the nets, to lead 11-8.
Saina was too aggressive to finish the rallies earlier but the Indian slowly changed her game and made the Chinese run across the court.