It was a nice restart for Hisingslaget after the Olympic break.
And in the away meeting with the top competitor Kristianstad, it was just two Olympic acquaintances who were behind the lead goal.
Stina Blackstenius - the national team's top scorer during the championship (five goals) - poked in 1-0 from close range, after fine preparation by Filippa Angeldahl.
The new acquisition netted
In the second half, the new acquisition Stine Larsen expanded in her competition debut.
The Dane, who joined from Aston Villa in June, rushed forward and nodded in 2-0.
In the 87th minute also came 3-0 when Johanna Rytting Kaneryd scored her fourth goal of the season.
Kristianstad, who left the Champions League last Saturday, scored a consolation goal in extra time (Anna Welin).
CL playoff against Vålerenga
The victory means that Häcken (29 points) takes on the series supreme Rosengård (35 points), who still has the loss zero intact.
On Tuesday, Häcken will meet Norwegian Vålerenga in the Champions League playoffs.
The return is played the following week and the winner of the doubles match goes on to the group stage.