Berger has enjoyed a fine start to her campaign in Sweden, first winning silver in the mixed relay event with Norway before storming to victory in the 15km individual next time out.
And the Olympic champion made it three top-three finishes from three and two wins from two in the 7.5km sprint and she still has the 10km pursuit to swiftly follow on in Ostersund.
Like the rest of the top four, Berger missed one of her 10 targets however she proved too quick to catch around the Swedish course as she won by nearly 17 seconds.
Berger clocked a winning time of 21:34.0 with Olena Pidhrushna of Ukraine 16.9 seconds back in second and Russian Olga Vilukhina a further 2.5 adrift in third.
Germany's Andrea Henkel was the only one of the top seven to record a perfect 10 however it was only good enough for fifth as another Russian, Olga Zaitseva, took fourth.