Mary was made to sweat it out by Vietnam's Anh vo Thi Kim with the Indian eventually registering a 3-2 win. She will be continuing her gold quest against Australia's Franks April on Sunday.
Coach Nieva feels there were several positives to be picked from India's campaign at World Championship.
Despite the loss, the 24-year-old from Delhi joined a rare club of world championship medallists from India.
The Delhi-boxer has never been among the most talked about in Indian circuit.
Gaurav is the only Indian remaining in fray now.
