Sachin, competing in the light flyweight category, defeated Chinese Taipei's Hsu Cheng-Yu to make the last-four stage. He will next be up against Russia's Volodya Mnatsakanyan.
Mnatsakanyan got the better of Filipino Carlo Paalam in his quarterfinal contest.
Next up in the first session was Naman (91kg), a boy who took to boxing for weight loss. Naman got the better of Romania's Cristian Razvan Filip to make the summit clash, where he will face Cuba's Dainier Christian Justiz.
Later tonight, Asian silver-medallists Ankush Dahiya (60kg) and Ashish (64kg) will also look to make the final.
While Ankush will face Turkey's Necat Ekinci, Ashish will take on Sergei Margarian of Russia.