Several WC players were missing in tonight's match due to injuries.
In their absence, others stepped forward at home in Linköping.
The Swedish move came a few minutes into the second half.
The successful player from the WC, Eric Johansson, stood for a good jump before he grumbled in 18-15.
It was followed up with effective blue-yellow defensive play and two quick goals by right-six Isak Persson, who had a good game.
Sweden suddenly had a five-ball lead (20-15).
Another Persson (Linus) was in collaboration with Johansson for one of the delicacies of the match when the right-handed nine with a hang in the air sent in 22-18.
When, in addition, Felix Claar, raised in Norrköping, got the goal shooter loose, the match was decided.
The Swedish victory is the third in a row in the EHF Euro Cup.
The return match is played in Jaen, Spain, on Sunday, a match that is broadcast on SVT.