M C Mary Kom advanced to the quarterfinals of the Asian women's Boxing Championships after comfortably winning her opening-round bout in Ho Chi Minh City in Vietnam on Thursday.The 34-year-old, who is a five-time world champion besides being an Olympic bronze-medallist, defeated local favourite Diem Thi Trinh Kieu in a split verdict in the opening round of the light flyweight (48kg) category.The four-time gold-medallist at this event is making a return to her preferred weight division after competing in the 51kg category, which was made an Olympic category before the 2012 Games.Mary Kom will now be up against Chinese Taipei's Meng- Chieh Ping, who got the better of Thailand's Panpradab Plodsai in her opening bout.