Prajwal scored a 7-5 6-2 win over Vishu while Garvit downed Fatehdeep, who had not lost a single set so far in the tournament, 6-1 0-6 3-6 in his quarter-final.
Fatehdeep began solidly, winning the first set with the loss of just one game but things changed dramatically after that and Garvit bageled his superior rival in the second sety to draw level.
The Delhi boy sealed the match in the decider to end the proceedings in two hours and 12 minutes.
The other semi-finalists are Shashank Nautiyal and M Sai Nikhil, both of whom had to dig deep against their respective opponents.
Shashank fought his way back into the match being a set down to outlast Punjab boy Udayan Bhakar 6-7(5) 6-3 6-2 while Nikhil got the better of Gnana Bhaskar 7-6(8), 6-4.
In the semi-finals on Friday, Garvit will face off against Sai Nikhil and in the other last four clash Shashank will take on Prajwal.
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In the girls under-16 singles, top two seeds S Snehadevi and Pranjala Yadlapalli had easy outing in the quarter-final matches as they too moved into the next round.
Snehadevi thrashed Himani Mor 6-1 6-1, while Pranjala got the better of Nayanika Reddy 6-3 6-1. More