The 19-year-old Tanwar, making his debut at the Games, is a bronze-medallist from the World Youth Championships.
Indian boxers Amit Panghal (49kg) and Naman Tanwar (91kg) on Friday advanced to the quarterfinals after notching up comprehensive wins in their opening bouts of the Commonwealth Games in Gold Coast, Australia.
Tanwar defeated Tanzania's Haruna Mhando in a lopsided unanimous verdict to make the last-eight stage in the afternoon session.
In the evening session, Amit got the better of Ghana's Tetteh Sulemanu in another one-sided bout that ended in judges ruling unanimously in the Indian's favour.
The 19-year-old Tanwar, making his debut at the Games, is a bronze-medallist from the World Youth Championships.
He had defeated reigning Asian silver-medallist Sumit Sangwan in the trials to make the squad.
Amit, on the other hand, is chasing a third successive international gold medal, having claimed top finishes at the India Open and the Strandja Memorial Tournament before comeing here.
Earlier, 2010 CWG gold-medallist Manoj Kumar had won his opening bout to enter the pre-quarterfinals of the welterweight 69kg category.
