Narender Berwal (+91kg) and Lalitha Prasad (49kg) were the latest ones to enter the last four with Amritpreet Singh (91kg) and Abhishek Beniwal (81kg) securing a semi-final berth earlier.
Silver medallist at the 2012 Youth World Championships, Berwal made a stunning recovery against Kazakh boxer Dastan Kurmanbetov after being down 1-4 in the opening round.
The reigning youth national champion displayed exceptional class as he came down heavily on his opponent with some hard-hitting punches in the second frame, which forced the referee to stop the contest.
The 17-year-old Prasad, who bagged the light fly weight title at the 2012 Tammer International tournament in Finland, gave a splendid account of his boxing skills against Jun Engkang of Indonesia.
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After a cautious opening three minutes of play (2-2), he made a strong charge in the second round with his effective counter punches. He scored five points as opposed to his rival's two points.
Prasad finally outplayed Engkang 11-7 to advance to the last four.
He will lock horns with Japan's light flyweight boxer, AIBA Youth World Championships quarterfinalist, Kosei Tanaka for a place in finals tomorrow.