 Complete the following phrase:  At the 2008 AIBA Youth World Boxing Championships Dychko defeated American cruiserweight Contender Nick Kisner in the quarterfinals 5-1. Then went on to lose 8:10 to Erislandy Savon, in the final match to earn a silver medal. He moved up to super heavyweight a year later, winning his first of three national championships at the weight. At the 2009 World Amateur Boxing Championships, he was eliminated after losing his second bout 11:15 to Denis Sergeev. At the 2010 Asian Games, Dycho defeated Iranian Rouhollah Hosseini 6:4 in the semifinal but lost the final 5:7 to local favorite Zhang Zhilei. In 2011 he beat Roman Kapitanenko 9:4 at a local tournament. At the 