Wagner twice reached eight metres in 2008, but did not qualify for the 2008 Beijing Olympics. He reached his third student final at the 2009 Universiade and jumps of 8.06 m and 8.15 m led to his selection for the 2009 World Championships in Athletics, where he was eliminated in the qualifying round. He failed to jump over eight metres in the 2010 and 2011 seasons, but represented his country at the 2011 European Athletics Indoor Championships. In 2012 he competed at the European Athletics Championships, getting knocked out in the qualifiers, but a personal best jump of 8.21 m in Brno gained him selection for the Czech Republic at the 2012 Summer Olympics. Unfortunately, he didn't reach the final.