Sandhu, who defeated Dowling in the final of the South Australian Open a week ago, appeared in good touch and coasted to a straight-game win with an all-round display.
In the semifinal match tomorrow, Sandhu will meet the second seeded Piedro Schweertman of the Netherlands.
Sandhu had yesterday beaten Qatar's Syed Azlan Amjed 11-5 11-7 11-7 in the second round.
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