The fast-rising Ankushita Boro (64kg) led the charge with a facile unanimous triumph over Turkey's Aluc Cagla. Boro is a silver-medallist from the Balkan Youth International Boxing Championship and the International Ahmet Comert Tournament.
"She beat me in her country, so it was only natural that I had to return the compliment in my own country," Boro said.
Also advancing to the quarterfinals were Shashi Chopra (57kg), Jyoti Gulia (51kg), a Golden Glove Tournament gold- medallist, Neetu (48kg) and Sakshi Choudhary (54kg).
Chopra, on the other hand, got the better of second seed Taiwan's Lin Li Wei-Yi to be just one win away from winning a medal.
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In the evening session, Balkan Youth International Championship gold medallist and the reigning national champion Neetu out-witted Bulgaria's Emi-Mari Todorova in her pre- quarterfinal bout.
Nitu was delighted after her victory.
"It was an easy bout for me. I had beaten her earlier in Bulgaria too and I knew how to tackle her," she said.
In the last Indian bout of the day, Choudhary upstaged fourth-seeded Indira Shudabaeva of Russia in a split verdict to move ahead in the championships.
India are already assured of two medals in the event after Neha Yadav (+81kg) and Anupama (81kg) found themselves in the semifinals due to small size of the draws.
Over 150 boxers from 38 countries are competing in the event, being held in India for the first time.