Multiple world champion Marte Olsbu Röiseland got a first individual biathlon Olympic gold with a perfect performance in the Beijing Games sprint on Fiday. Norwegian World Cup leader Röiseland hit all 10 targets on the shooting range and clocked 20 minutes 44.3 seconds over the 7.5 kilometres. Sweden’s Elvira Öberg took silver 30.9 seconds back and Italy’s Dorothea Wierer earned a third career bronze another 6.3 seconds back. Both also shot clean. Röiseland won sprint (and relay) silver at the 2018 Games and now has three medals from as many races in Beijing: sprint and mixed relay golds and 1…