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 men's 8K race. At the
2012 World Junior Championships in Athletics, he competed in the
men's 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 men's race behind
Poland's
Szymon Kulka, winning Bulgaria's first ever medal in the
European Cross Country Championships. At the
2013 European Cross Country Championships, he finished second overall again, except this time in a lengthier-distance U23 race. In 2014, he placed ninth of fifteen competitors in the finals of the
men's 3000-meter steeplechase at the
2014 European Athletics Championships. In 2015, he began trying several different disciplines for which he had trained less for in the past. On May 17, 2015, at the Elite Meeting in
Montgeron, Tsenov won the men's 3000 meters. On June 10, 2015, he won the 1500 meters in Bulgaria's national championship. He fulfilled the
2016 Summer Olympics qualifying standard for the
3000 meters steeplechase on May 29, 2015. ==References==