France held off a spirited second-half comeback from Argentina to win their World Cup Pool C opener 23-21 at the Tokyo Stadium.
France tryscorers: Fickou, Dupont
France conversions: Ntamack (2)
France penalties: Ntamack (2)
France drop-goals: Lopez
Argentina tryscorers: Pagadizabal, Montoya
Argentina conversions: Sanchez
Argentina penalties: Sanchez, Urdapilleta (2)
Les Bleus looked in total control at 20-3 after tries from Gael Fickou and Antoine Dupont, with 20-year-old fly-half Romain Ntamack converting both before kicking two penalties.
However, the Pumas hit back soon after the restart when Guido Petti Pagadizavalgh bundled over from a line-out, before Argentina replacement hooker Julian Montoya touched down.
Penalties from Benjamin Urdapilleta then put Argentina ahead, before Camille Lopez's drop goal saw France edge through the closing stages.
Argentina had been aiming to repeat their shock victory over Les Bleus in the opening match of the 2007 World Cup in France, where they went on to reach the semi-finals.
🏉🇫🇷 France's only score of the second period versus Argentina.
— Sporting Life (@SportingLife) September 21, 2019
💪 But it's a crucial drop-goal as they emerge 23-21 in front...#FRAvARG pic.twitter.com/WUjft51wIv
After a cagey start, Nicolas Sanchez kicked a penalty wide in the 12th minute.
The Stade Francais fly-half, though, was soon off the mark when an offside in the French defensive line gave him another penalty opportunity in front of the posts.
France produced an instant response to score the opening try in the 16th minute.
Peato Vakatawa showed some great footwork before finding Fickou on a break down the left to go over. Ntamack, son of former France international Emile, made the conversion to put his side 7-3 in front.
Les Bleus scored another flowing try when scrum-half Dupont finished off an impressive move in the corner.
Ntamack added a penalty to extend the advantage to 17-3 as the half-hour mark approached.
After Argentina failed to make the most of some sustained pressure, fly-half Ntamack continued to show a cool head to convert another penalty and send France into the break with a seemingly healthy 20-3 lead.
Argentina, though, reduced the deficit just two minutes into the second half following a well-worked line-out.
A long, high throw saw second-row Pagadizaval bundled over. Sanchez converted the angled kick to bring Argentina back within 10 points.
Argentina replacement hooker Julian Montoya came on to win his 50th cap - and made an instant impact from a driving maul to score after Pagadizaval had taken a line-out catch in the 54th minute.
While Sanchez missed the conversion chance, the Pumas continued their momentum.
After a breakaway opportunity was eventually halted, replacement Urdapilleta kicked a penalty, for an earlier infringement by Damian Penaud, to close the gap down to just two points.
France were starting to lose composure and lock Sebastien Vahaamahina gave away 10 yards for a push, which put the penalty in kicking range.
After a TMO review for Emiliano Boffelli's jumping challenge on Penaud, Castres Olympique fly-half Urdapilleta sent a left-foot effort over as Argentina edged in front 21-20.
France, though, produced an instant response when replacement Camille Lopez sent a drop-kick just over the bar, with Ntamack then missing a penalty chance.
There was still time for more drama as Urdapilleta saw his long-range kick drop just the wrong side of the posts as France held out - before tempers boiled over at full-time with some scuffles.
France coach Jacques Brunel admitted a sense of relief after his side held off Argentina's superb second-half comeback to win their World Cup Pool C opener 23-21 at Tokyo Stadium.
France were seemingly in total total control at 20-3 following tries from Gael Fickou and Antoine Dupont, with 20-year-old fly-half Romain Ntamack converting both before kicking two penalties.
The Pumas, though, made a breakthrough early in the second half when Guido Petti Pagadizabal bundled over from a line-out, before replacement hooker Julian Montoya touched down.
Penalties from Benjamin Urdapilleta then saw Argentina move ahead, before Camille Lopez's drop goal saw France edge through the closing stages.
"We are relieved of the result, but not totally satisfied with the performance," Brunel said at a press conference.
"We have shown hesitations, gaps. It must be rectified to go further in the competition.
"There were deficiencies shown in the second period after we had controlled the first half well.
"We had difficulties in the tackle and the Argentines came back in the game too quickly, even if we had expected it.
"We still have work to do, but we know what to focus on so that is good."
Ntamack followed father Emile in playing for France at the World Cup.
The fly-half said: "It was a really, really tough game. We knew we'd face a really strong Argentina team and after a stressful game we're happy to have won here."
Argentina had been aiming to repeat their shock victory over Les Bleus in the opening match of the 2007 World Cup in France, where they went on to reach the semi-finals.
Pumas head coach Mario Ledesma was left to reflect on what might have been, with Urdapilleta's late, long-range kick dropping just the wrong side of the posts.
"We missed opportunities in the first half and that second half, (it was a) very good second half," he told reporters.
"We didn't do anything in the first half - defended badly and didn't attack well, lost every ball into contact, so just not doing what we've been doing for a while now.
"In the second half we created many opportunities, scored and also just missed two points (near the end)."
Pumas captain Pablo Matera is determined the squad will bounce back.
"I feel very bitter because we can win this kind of match," he said.
"We gave a big advantage to the opponent. There is no room for more mistakes, we have three more important games."