Priyanka Chaudhary (54kg) clinched it by the smallest of margins against Minova Ayako of Japan after fighting out a tense quarter-final bout, on Thursday.
Priyanka was tied 1-1 with Ayako in the opening round. She nosed ahead to 2-1 in the second round but Ayako fought back to make it 3-3 at the end of the regulation four rounds.
The Indian was declared winner after accepted individual scores put her 7-5 ahead of her rival.
Pavitra (57kg), on the other hand, had no trouble getting past another Japanese Kugimiya Tomoko 11-2. The Indian led all through the bout and was never troubled by her rival.But there was disappointment to follow in the light weight 60kg category in which Usha was knocked out.
Usha was expected to have it easy against Chorieva of Tajikistan, a country which is participating for the first time in the event.After the opening two minutes ended 0-0, Usha was on the backfoot in the second round with Chorieva taking a 2-0 lead.
She came back to make it 3-3 in the third round and the two were tied 4-4 for most part of the final round as well. But with 20 seconds left on the clock, Chorieva landed a scoring punch to leave the Indian camp stunned.
"It was not expected. Usha was the hands down favourite but just a few seconds before the end, she lost the bout. It's very disappointing," said Indian Boxing Federation Secretary General P K Muralidharan Raja, who is in Astana as a technical delegate.
Earlier, four-time world champion M C Mary Kom (46kg), L Sarita Devi (51kg), Sonam Yadav (75kg) fought their way to the semis, while Kavita Goyat (69kg), Aswathi Mol (81kg) and Kavita Chahal (+81kg) got byes into the last-four stage.
India has sent an 11-strong team for the event, which has 16 countries in participation
