 Complete the following phrase:  Tsenov made his first major international appearance at the 2011 IAAF World Cross Country Championships, where he placed 86th out of 106 finishers in the junior mens 8K race. At the 2012 World Junior Championships in Athletics, he competed in the mens 3000-metre steeplechase, where he narrowly missed qualification to the final round. At the 2012 European Cross Country Championships, he finished second overall in the junior mens race behind Polands Szymon Kulka, winning Bulgarias first ever medal in the European Cross Country Championships. At the 