At the FIS Nordic World Ski Championships 2013 in Vale di Flemme, Ustiugov with his relay team claimed the bronze medal. In the individual 15 km free style race he became 47th. In the same year he reached a podium place for the first time in Davos on 15 December, finishing third in free style sprint. The next month he won a stage in the Czech Nové Město in free style sprint. He debuted at the 2014 Winter Olympics in sprint, where he became fifth after falling down near the final passage. In May 2014, Ustiugov moved to a separate group of the national team headed by the Swiss-German duo Reto Burgermeister/Isabel Knaute and so left the group headed by Oleg Perevozchikov.