Already in the second minute, Kalmar's goalkeeper Tobias Andersson came out completely wrong on a deep lead ball and Joel Nilsson intercepted the ball in front of the feet of an rushing Andersson.
Nilsson then rolled the ball in from a long distance.
And just three minutes later came a new cold shower for Kalmar.
Free kick from the right and the ball steams down in front of Amin Sarr, who shot the ball into Andersson's left corner.
It was not Tobias Andersson's day in the Kalmar goal.
With 18 minutes played, Elias Andersson could have brought this one home for Elias Andersson as he charged up on the left, but his hooked ball went just a bit too high.
Via the goalkeeper gloves, the ball went into the net for the third time for Mjällby.
Substitute club icon Jacob Bergström crowned the big victory with his 4-0 goal in the 83rd minute.
- It's magical.
Of course I am extremely proud of the journey we have made since the last Kalmar match, said the goal scorer in Discovery's broadcast.