Nilsson and Norwegian Anikken Gjerde Alnæs crossed the finish line side by side, seemingly at the same time.
In the initial finish graphic, Gjerde Alnæs was declared the winner. But after a few nervous minutes, the announcement was changed - and the victory went to Stina Nilsson instead.
There was a lot of will in that sprint, I can say, Nilsson said on SVT's broadcast and continued:
Both Anniken and I are two little bullheads who are happy to challenge each other to a fight. It was make-or-break, and today it paid off well.
The tension was there long before the sprint.
With only one kilometer left in the race, six skiers were fighting for victory.
In the end, another Swede managed to take a place on the podium. Hanna Lodin took third place, just ahead of Hedda Bångman.
On the men's side, Olympic qualifier Alvar Myhlback couldn't quite make it to the top.
The 19-year-old Swede stayed with the lead group for a long time and moved up in the close battle.
With just over a kilometer to go, Myhlback was challenging for the podium places - having gained place after place during the final stages of the race.
However, he couldn't sustain it for the whole race. In the last kilometer, Myhlback lost a few positions and crossed the finish line in ninth place, just behind the winner, Norway's Amund Riege.
Frenchman Jeremy Royer came in second, while another Norwegian, Magnus Vesterheim, secured third place.
The best Swede in the race was Axel Jutterström, who impressed with a fifth place.
Alfred Buskqvist ensured that there were three Swedes in the top ten with his tenth place.
