Wallstedt, 19 (11/14/02), went 11-9-2 with a 1.98 goals-against average (GAA), a .918 save percentage (SV%) and three shutouts in 22 games with Lulea HF in Sweden's Elite League this season. He led the Swedish Elite League in GAA, ranked fourth in SV% and T-6th in shutouts. The 6-foot-3, 214-pound native of Vasteras, Sweden, allowed two goals or less in 16 of his 22 starts. Wallstedt went 2-0-0 with a 1.50 GAA, a .962 SV% and one shutout in two games for Sweden at the 2022 IIHF World Junior Championship. He stopped all 48 shots faced in a 3-0 win vs. Slovakia on Dec. 27, 2021.
Wallstedt went 11-8-3 with a 2.23 GAA, a .907 SV% and two shutouts in 22 games with Lulea in 2020-21 and ranked fourth in the Swedish Elite League in GAA. He also appeared in two games for Sweden at the 2021 IIHF World Junior Championship, going 0-1-0 with a 2.40 GAA and a .923 SV%.
The Wild selected Wallstedt in the first round (20th overall) of the 2021 NHL Draft.