The Frenchman won eight races en route to the World Cup title last season, and after winning the very first on Wednesday, he has already claimed win number two.
In the 12.5km pursuit, he picked up just one penalty on the shooting range to post a time of 33:03.5 minutes – good enough for victory over Germany's Andres Birnbacher by just 0.7 seconds.
Russia's Anton Shipulin was third but already Fourcade has opened up an impressive lead at the top of the overall standings.
In the women's event, Tora Berger went one better than Fourcade and completed a stunning clean sweep in Sweden, making it three wins from three.
The three-time 2012 world champion, having already won the 15km individual and the 7.5km sprint in Oestersund, stormed home in Sunday's 10km pursuit to complete the hat-trick.
Berger crossed the finishing line in 31.01.9 minutes, having suffered just one penalty on the range, a full 29.8 seconds ahead of second placed Darya Domracheva of Bulgaria while Germany's Andrea Henkel completed the top three.