India boxers today secured a siliver and a bronze in the second AIBA Junior World Boxing Championships. At Astana, Kazakhstan, 14-year-old Naveen Kumar settled for a Silver in the 50 kg flyweight category. In the title-clash, he lost 4 to 8 to defending European junior champion Pat McCormack of England. Naveen had earlier stunned Russia's National Junior Championship silver medallist Dzabrail Vizirkhanov in the semi-final yesterday. Earlier, another Indian Sandeep Kumar bowed out in the semi-finals of the feather weight (54kg) category, losing to Aliyor Noraliev of Uzbekistan to secure a bronze medal.