Born in Russia's Smolensk Oblast, Fyodorov had international success at a young age, taking the silver medal at the 2007 World Youth Championships in Athletics. He marked himself out as one of the world's most promising jumpers by clearing sixteen metres in 2008 before winning gold medals at the 2009 European Athletics Junior Championships and 2010 World Junior Championships in Athletics. He was Russia's first world junior champion in that event since Sergey Bykov's win in 1990.