Sweden opened their World Cup campaign with a ruthless performance, easing past Tunisia 5-1 in a match that underlined the attacking depth Graham Potter has built. It was not flawless — but what mattered was control, clarity and a front line that looked sharp from the first whistle. Gyökeres strikes early Viktor Gyokeres and Alexander Isak, the two strikers Sweden have long hoped would peak at the same time, delivered exactly what Potter wanted: movement, power, and goals. Between them, they set the tone for a night that rarely drifted from Swedish hands. Tunisia had their moments, especially early on, but…