Södertälje got off to a good start when Samuel Berkelund and Martin Pahlmblad each scored three points.
But after that Norrköping took over.
Adam Ramstedt did a great job defending under the basket, while Felix Terins impressed from the three-point line, where he sat four of five threes during the first half.
Södertälje lost their defense, which Norrköping made the most of.
And the home team went into the halftime break with a 26-point lead, 59-33.
- They totally dominate us.
We are far too awkward in all the decisions we make.
It looks dark, Södertälje's Dino Pita told SVT Sport at half time.
The home team dominated
Norrköping kept the same high pace in the second half and the match was never really exciting.
The match ended 99-70 for the home team, which is now a victory from the Swedish Championship gold.
The next match will be broadcast on SVT2 / SVT Play starting at 15.50.
Even then, Norrköping has a home ground.
ARCHIVE: Basketball coach: "Missed my one-year-old daughter's first cake" (May 19)
Javascript is disabled
Javascript must be turned on to play video
Read more about browser support
The browser is not supported
SVT does not support playback in your browser.
We therefore recommend that you switch to another browser.
Read more about browser support
Norrköping's coach Mikko Riipinen and Felix Terins.
Photo: SVT / Bildbyrån