- Samuel Umtiti headed in the only goal after 51 minutes at Krestovsky Stadium to set up a final meeting against Croatia or England for Les Bleus.
Jan Vertonghen conceded he had his work cut out trying to shackle rampant France forward Kylian Mbappe during Belgium's narrow World Cup semi-final defeat.
Samuel Umtiti headed in the only goal after 51 minutes at Krestovsky Stadium to set up a final meeting against Croatia or England for Les Bleus.
But it was Paris Saint-Germain teenager Mbappe who proved the most consistent and potent attacking threat within an otherwise cautious display from Didier Deschamps' side.
Vertonghen was deployed on the left-hand side of a hybrid three/four-man Belgium defence – a tactic head coach Roberto Martinez retained from the impressive 2-1 quarter-final win over Brazil.
Within the opening 10 seconds of the match, Mbappe darted past the Tottenham defender, who stuck to his task manfully from that point onwards.
"It's been a while because in the last three years with this coach I haven't been playing left-back and neither at Tottenham, so I had to switch on a bit," he said.