Chernousov's first World Cup victory was in the 4×10 km relay in Switzerland in 2007. His best individual results came in the 30 km pursuit in 2011: a third place at the world championship and the first place at the world cup. At the FIS Nordic World Ski Championships 2007 in Sapporo, he finished 31st in the 15 km + 15 km double pursuit event.