Pallikal took 50 minutes to down the higher-ranked opponent. She started brilliantly against the pre-tournament favourite and took the opening game to lay down the marker.
However, Au came back strongly to claim the second game with a series of impressive stroke-making.
Pallikal seized the initiative from thereon and kept Au off balance by staying aggressive.
The Chennai-based Pallikal closed out the match for a memorable win.
With this victory, Pallikal has posted only her third win over the Hong Kong player, ranked 11th in the world, in 10 meetings.
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