Mezue ahịrịokwu na-esonụ: Ọ malitere ọrụ ya na Swedish Elite League na Färjestads BK na Swedish World Junior Championship teams. N'ime
1998 Entry Draft, Berglund ghọrọ nhọrọ nke atọ nke New Jersey Devils, ebe a họọrọ ya na agba nke abụọ dị ka nhọrọ 37th n'ozuzu. Ọ gara n'ihu na-egwu maka Färjestad ruo 2001, mgbe ọ bịanyere aka na Devils. Ọ na-egwuri egwu na obere egwuregwu Albany River Rats, ndị Devils 'ndị mmekọ, ma malite igwu egwu maka ndị Devils n'onwe ha mgbe e mesịrị n'oge ahụ. Na 1 Machị 2004, a gbanwere ya na onye otu ya Victor Uchevatov na Florida Panthers iji gbanwere Viktor Kozlov.