Häggström could even stop a bit on the goal line when he won before the American Kevin Bolger and Marcus Grate.
The victory is probably a welcome receipt for Häggström who has recently had a cold.
Both Anton Persson, who was the best in the qualifiers, and Olof Jonsson had their finals ruined due to falls.
National team skiers Oskar Svensson and Calle Halfvarsson were missing in the premiere.