Johannes Hoesflot Klaebo made a significant impact from his professional debut, securing two bronze medals in the classic sprint and relay at the 2015 Junior World Championships in Almaty, Kazakhstan. The following year, in February 2016, he dominated the Râ?nov Junior World Championships in Romania, earning three gold medals across the freestyle sprint, 10km classic, and relay events. Joining the World Cup circuit that same season, Klaebo quickly established himself, achieving his first World Cup podium with a third-place finish in the classic sprint in Ruka, Finland, in November 2016. He claimed his inaugural World Cup victory in the sprint freestyle in Otepää, Estonia, on February 18, 2017, and later added a bronze medal at the FIS Nordic World Ski Championships in Lahti, Finland.
Looking ahead, he achieved an unprecedented medal sweep at the 2025 World Championships in Trondheim, capturing gold in all six events: sprint freestyle, 20km skiathlon, 10km interval start, team sprint classic, 4×7.5km relay, and the 50km mass start. His consistent record of breaking new ground and accumulating top-tier victories makes him a highly marketable figure globally.