London Olympics bronze medallist Saina made short work of Minatsu Mitani 21-12 21-10 in her second round contest, which lasted just 38 minutes.
Before Saina's win, two-time World Championships bronze medallist Sindhu took just 31 minutes to get the better of Ksenia Polikarpova of Russia 21-17 21-19 at the Odense Sports Park.
Since the top two women shuttlers from India are in either half of the draw, they could clash for the title if they win two more matches.
World No. 10 Sindhu opened up a 4-0 lead in the first game and continued to widen the gap, eventually winning it 20-17.
In the second game, Sindhu quickly broke away from a 2-2 tie to take a slight edge and then she kept on extending it to make it 19-15 at one stage. But a brief fight back from the Russian saw her closing the gap to 19-20 before Sindhu used all her experience to wrap it up in her favour.
After a neck and neck battle till 13-13 in the opening game, Kashyap bagged four consecutive points to make it 17-13 and then there was no looking back for the Indian.
But the Indonesian shuttler came back strongly in the second game as he opened up a huge 7-1 lead.
Although Kashyap managed to reel off six points on a trot to catch his opponent, the Indonesian showed a lot of determination to keep the Indian at bay and take the match to the decider.
