Marte Olsbu Røiseland, Tiril Eckhoff, Johannes Thingnes Bø, and Vetle Sjåstad Christiansen of Norway won the opening race, a mixed relay, of the IBU World Championships in Östersund, Sweden. The foursome won the race in 1:17:41.3 hours. The race format requires women to contest the first two legs, or 2 x 6-kilometers, whereas as the men ski the final two legs, or 2 x 7.5 k. On the way to the win, Norway used seven...