Norway secured a classic sprint double as Johannes Høsflot Klæbo and Maiken Caspersen Falla won the men's and women's races respectively at the International Ski Federation Cross-Country World Cup in Otepää in Estonia.
Klæbo, who won three gold medals at last year's Winter Olympic Games in Pyeongchang, earned a comfortable win to strengthen his lead at the summit of the overall standings.
The 22-year-old, who has the potential to dominate the cross-country discipline, finished the 1.6 kilometres course in 3min 20.05sec in the final.
Russian Alexander Bolshunov narrowly made it through to the final despite a fall in the semi-final and worked hard for his silver medal, crossing the line 1.51sec behind the victorious Norwegian.
Third place was claimed by Klæbo's compatriot Paal Golberg.
"He (Bolshunov) is really strong and he was pushing hard from the start but it's very cool to win here again and I have my grandpa who is living here so that's even better," said Klæbo.
Falla booked her place in the women's final in a dramatic photo finish, where current Sprint World Cup leader Stina Nilsson of Sweden suffered a fall.
The injury forced Nilsson out of the final, won by the Norwegian three-time Olympic medallist in 3:05.16.
Natalia Nepryaeva of Russia and Maja Dahlqvist came through to take second and third respectively.
The event in Otepää continues with the women's 10km and men's 15km events.