Six-time Asian Championships medallist Shiva Thapa (63.5kg) and World Championships runner-up Amit Panghal (51kg) maintained their impressive form to advance into the quarterfinals of the Men's National Boxing Championships on Wednesday. Thapa, who won a gold medal in the last edition, demonstrated his prowess with a commanding 5-0 victory over Santhosh HK from Karnataka. The Assam pugilist will now face Shashank Pradhan of Delhi in the quarterfinals. Representing SSCB, Panghal warded off a challenge Punjab's Jayshandeep Singh 4-1 to set up quarterfinal bout against Mohammad Aarif of Jammu and Kashmir.