Novosjolov won a silver medal in the team men's épée event at the 2001 World Fencing Championships in Nîmes, France; a gold medal in the individual men's épée event at the 2010 World Fencing Championships in Paris, France; a gold medal in the individual men's épée event at the 2013 World Fencing Championships in Budapest, Hungary; and a silver medal in the individual men's épée event at the 2017 World Fencing Championships in Leipzig, Germany.