Fourth seed Shiva Thapa settled for a silver medal at the Asian Boxing Championships after an injury-forced loss in the final in Tashkent today. Sumit Sangwan in 91kg category notched up his maiden podium finish and settled for silver medals.The 60 kilogram weight category boxer Shiva Thapa also became the first Indian to claim three back-to-back medals at the continental showpiece.Shiva, up against second seed and local favourite Elnur Abduraimov, lost in a split verdict after a head-butt from his opponent resulted in a cut. It was in the final few seconds of the opening round when Shiva sustained the cut, forcing a stoppage by the referee.The silver is his third successive medal at the continental showpiece after a gold in 2013 and a bronze in the 2015 edition. The Assam-pugilist, a World Championships bronze – medallist in bantamweight (56kg), shifted to lightweight in December last year.Boxer Sumit Sangwan in 91kg category notched up his maiden podium finish and settled for silver medals. Sumit lost to Kazakhstan's top-seeded Vassiliy Levit. Levit is the silver-medallist from last year's Rio Olympic Games.There was also some disappointment for India with Gaurav Bidhuri (56kg) and Manish Panwar (81kg) losing their box-off bouts for World Championship slots. While Gaurav lost to Japan's Ryomei Tanaka, Manish went down to Pakistan's Awais Ali Khan. Both the boxers were defeated in a split verdict.