Lucas Pouille was the hero as he dominated Steve Darcis to help France clinch a first Davis Cup title since 2001 after being taken the distance by Belgium.
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France won Saturday's doubles to sit on the brink of victory in Lille, but David Goffin's beat Jo-Wilfried Tsonga to take the contest to a decisive fifth rubber.
And, with the weight of an expectant home crowd on his shoulders, 23-year-old Pouille delivered the goods with a 6-3 6-1 6-0 beating of the experienced Darcis.
Victory means France move level with Great Britain to third in the all-time list of winners with 10 titles, while Belgium - who lost to the British in the final two years ago - are still awaiting a maiden triumph.
Pouille was dominant from the off and broke at the first time of asking when Darcis put a forehand in the net.
@la_pouille in charge in the deciding rubber in Lille. The Frenchman takes the opening set 63 after 35 minutes#DavisCupFinal pic.twitter.com/Q7ZcYvX4m4
— Davis Cup (@DavisCup) November 26, 2017
Darcis was unable to recover from that setback, and completely wilted in the second set - the 33-year-old saving a break point in game one, but failing to hold serve again.
It was a familiar story at the start of the third as Darcis smashed a forehand into the net to relinquish serve, and he would not win another game as the French celebrations began at the Stade Pierre Mauroy.
France wins the #DavisCup!@la_pouille defeats Steve Darcis 63 61 60 to clinch a 10th title for the French
— Davis Cup (@DavisCup) November 26, 2017
pic.twitter.com/LtOw8jvNFW
Goffin had kept Belgium's hopes alive with a 7-6 (7-5) 6-3 6-2 victory over Tsonga.
Tsonga missed six break-point chances in a tense first set, and another went begging in the second when Goffin saw out the danger with a brilliant driving forehand followed by a volleyed winner at the net.
A costly double fault in the next game gave Goffin the crucial break, and Tsonga's resolve dwindled in a third set dominated by the ATP Finals runner-up.
But the efforts of Goffin, who won both of his singles' rubbers, were to prove immaterial thanks to Pouille's heroics.