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With both sides facing a daunting route to Euro 2020 glory, it was Belgium who emerged to reach a quarter-final tie against in-form Italy thanks to Thorgan Hazard's long-range strike.
It was a goal that deserved to settle a game of few chances, although De Bruyne's substitution early in the second half will concern Roberto Martinez, as will Eden Hazard’s departure late in the match.
Portugal could not capitalise and paid the price for a third-placed Group F finish that condemned them to this side of the draw.
At odds with a tense finale, opportunities were few and far between prior to Belgium's spectacular 42nd-minute opener.