Monterrey (Mexico): Yasin Ayari scored twice, pounding Tunisia 5-1 to move a top Group F. Alexander Isak and Viktor Gyökeres each had a goal and an assist, and Mattias Svanberg also scored for Sweden, which entered 39th rank in the world.
Omar Rekik scored for 45th-ranked Tunisia, which is playing in its seventh World Cup but has never advanced beyond the group stage.
The higher-ranked teams in the group, the Netherlands and Japan, played to a 2-2 draw earlier Sunday at Arlington, Texas.
Ayari bookended the scoring for the Swedes at Estadio BBVA with long-range goals in the seventh minute and in second-half stoppage time. He was muted in his celebration of the first goal, raising his hands out of respect for the country.
Isak scored his 18th international goal in the 30th minute when Gyökeres found the Liverpool striker — who was sidelined much of last season with a broken leg — on a counterattack. Isak cut inside and fired a low shot past the hands of Tunisian goalkeeper Mouhib Chamakh.
After Rekik stalled Sweden's momentum with his goal in the 43rd minute, Isak and Gyökeres put Sweden back in control. Isak stole the ball and found Gyökeres for a one-on-one against Chamakh that the Arsenal striker won easily for his 16th goal in his last 15 appearances for Sweden and 21st overall.
Svanberg scored in the 84th minute, a goal that was awarded after a lengthy video review.
Sweden will play the Netherlands at Houston on Saturday, while Tunisia will remain in Monterrey and face Japan the same day.