After undergoing another hernia surgery, Korolev made a comeback on the Challenger Circuit in the fall. His biggest successes were a title win in Aachen and a semifinal showing in Düsseldorf.
After undergoing another surgical procedure for his hernia, Korolev regained his footing on the Challenger Circuit in the fall season. He achieved his most significant successes by claiming the championship in Aachen and advancing to the semifinals in Düsseldorf.