Inspired Oestberg beats out compatriot Johaug in Toblach pursuit
Oestberg won the first Cross-Country World Cup race of the year in a time of 26:51.5, with compatriots Johaug and Heidi Weng finishing the podium, while Natalia Nepryaeva of Russia took fourth spot.
Weng victorious as cross-country season closes in Switzerland
A rare setback for Johaug doesn't impact on the overall standings, however, still leading 159 points clear at the top.
In the men's race, it was Alexander Bolshunov who won the 15km in 38:14.9, while fellow Russian Sergey Ustiugov finished second and Finland's Iivo Niskanen took third.
The result takes Bolshunov closer to overall leader Johannes Hoesflot Klaebo in the World Cup standings, the Norwegian having finished the first race of 2020 in tenth.
Stupak and Bolshunov lead the way in Engadin
Yuliya Stupak doubles for Russia with 10km Mass Start victory