Indian boxer Shiva Thapa ended his campaign at the Asian/Oceania Qualifying Tournament in Qian'an, China, today with a silver medal in the 56 Kilogram category final. The 22-year-old Shiva went down 0-3 to Thailand's Chatchai Butdee in the summit clash. Butdee is the reigning Asian champion while Shiva is a World Championship bronze-medallist,Shiva had already booked his ticket to Rio de Janeiro Olympics by making the finals yesterday after beating Kazakhstan's Kairat Yeraliyev.Meanwhile, it was a heartbreak once again for L Devendro Singh (49kg), who missed a second opportunity today to qualify for the Olympics. He lost 2-1 against Mongolia's Gan-Erdene Gankhuyag.