Joshna won a close first game but went on to win the next one comfortably before losing her way in the third and fourth. The third seed bounced back to win the decider for a 15-13, 11-6, 6-11, 9-11, 11-4 win.
She takes on local favourite and second seed Annie Au in the semifinals tomorrow.
It was not a day to remember for Dipika as she was outplayed by Joelle of New Zealand 8-11, 6-11, 8-11 in the quarterfinals.