Unseeded Karman upset the seventh seeded fellow Indian, Vasanti Shinde 6-4, 6-3 while in another quarters today Ojasvinee ousted Russia's Anna Ureke 6-2, 7-5.
Top-seeded Pranjala Yadlapalli went down fighting against Raveena Kingsley, the US-girl who had won last week's Grade 2 ITF Juniors in Delhi.
Raveena took a quick lead of 4-1 in the opening set but Pranjala broke back little later to stretch the match to a tie-breaker which the American won by a close 9-7.
In the boys' singles, French duo of Clement Larriere, the fourth seed and Geoffrey Blancaneaux, the seventh, entered the last four from different halves of the draw.
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Larriere defeated Tung Lin Wu of Chinese Taipei 6-4, 6-2 while Blancaneaux shattered hopes of third seed India's Garvit Batra 6-3, 6-3.
They are joined by the unseeded but strong Mandresy Rakotomalala, the recent champion from Delhi's Grade 2, who surpassed India's Paramveer Singh Bajwa by a clean 6-1, 6-2.
Boys' singles: Mandresy Rakotomalala (FRA) bt Paramveer Singh Bajwa 6-1, 6-2; Clement Larriere (FRA)(4) bt Tung Lin Wu (TPE) 6-4, 6-2; Geoffrey Blancaneaux (FRA)(7) bt Garvit Batra (3) 6-3, 6-3; Sameer Kumar (USA)(5) bt Alex Solanki 6-1,6-1
Girls singles: Raveena Kingsley (USA) bt Pranjala Yadlapalli (1) 7-6(7), 6-4; Zhanlan Wei (CHN)(8) bt Tamachan Momkoonthod (THA)(4) 7-6(2), 6-2; Karman Kaur Thandi bt Vasanti Shinde (7) 6-4, 6-3; Ojasvinee Singh bt Anna Ureke (RUS)(5) 6-2, 7-5.