Mary Kom, who was returning to action after a one-year hiatus, went down by an unanimous decision to Korean Chol Mi Bang.
The 34-year-old, a five-time world champion and an Olympic bronze-medallist, struggled to connect against her taller rival and was even warned once for excessive bending.
Mary Kom would be going back to the light flyweight 48kg category after this to focus on the Asian Championships in November and the Commonwealth Games next year.
While Ankush outpunched Mongolia's Dulgunn Oyunchimeg, Priyanka got the better of Russia's Aleksandra Ordina.
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Ankush will be up against Russian Radna Tsibikov in his last-four stage. Priyanka, on the other hand, will square off against Korea's Hye Song Choe.
However, Duryodhan Singh (69kg) lost to Mongolian Byamba-Erdene Otgonbaatar in his quarterfinal bout to bow out of the event.
Also making an exit was Kalawanti (75kg) who lost to Russian Liubov Iusupova.
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