The Kolkata girl, who now plays for Andhra Pradesh after shifting base to Hyderabad, proved too good for the defending champion to win 21-14 21-7 to add the u-19 national title to the u-13 and u-17 national crowns she had won in the past and completed a double crown herself by also bagging the girls doubles title with J Meghana.
She was deceptive at the net and came up with some timely drops to tackle the reach of the lanky Khamman girl, who had earlier got the better of Maharashtra's Karishma Wadkar in the u-17 final.
Karishma, playing in her maiden national final, managed to push the defending champion in the first game but a few unforced errors at the crucial moment cost her dearly.
In the boys' under-19 final, Arun who had staged improbable comebacks in the pre-quarterfinals and the semifinals began on the positive note but once Joshi got his rhythm going it was a one-way traffic.
In the u-17 boys' singles final, S Daniel Farid ended the dream run of B R Sankeerth 21-11 21-14.