TOKYO, 21 Sep - France and Argentina served up a classic to launch Pool C and the result was in doubt until the final minute, when a long-range penalty from full-back Emiliano Boffelli missed by inches.
Jacques Brunel's youthful French side had turned on the style to take a 20-3 lead at half-time, scoring two beautifully worked tries through man-of-the-match Gael Fickou and Antoine Dupont. Yet Argentina swarmed all over them in the second half, even clawing themselves into a 21-20 lead for a couple of glorious minutes.
The match was a stark contrast between the respective kickers, Romain Ntamack and Nicolas Sanchez. Ntamack kicked his first four attempts; Sanchez was withdrawn after an hour. Had Sanchez shown the form which made him leading points scorer at RWC 2015, Argentina would almost certainly have won.
Argentina captain Pablo Matera was withering in his assessment: "It was not good enough - a really bad start from us as a team. It's not good enough with only one (strong) half."
Guilhem Guirado, France's captain, was a relieved man. "I thought the game was finished and we'd lost," he said. "I'm very, very proud of my boys and very happy to start the competition with a win. We never controlled the game in the second half but we are very proud of the first half because we were very clinical. When we play like this we are very dangerous."
After a tight, error-strewn opening, Argentina edged in front in the 15th minute with a Sanchez penalty. Having already missed once, he made no mistake after a barrelling run from Tomas Lavanini put the French on the back foot and they went offside.
If this youthful French side were alarmed, it did not show and they hit back with two tries in five minutes. First, Damian Penaud pinned back Argentina on their left, and the ball was worked to the far corner for Fickou to touch down.
Penaud was again involved when scrum-half Dupont rounded off a magnificent move, featuring numerous changes of direction and clever offloads, by nipping over in the right corner, above. It was Dupont's fourth try in his past five matches.
On both occasions, 20-year-old fly-half Ntamack added difficult conversions with nerveless authority. Ntamack, the son of Emile Ntamack, who played in the 1999 final for France, added two penalties for high tackles to extend France's lead to 17 points by half-time as the Pumas lost control of the game and their discipline.
Mario Ledesma's side needed something to build on early in the second half and found it when second-row Guido Petti, above, scored a converted try from the back of a lineout. Suitably fired up, they bombarded the French line and in the 54th minute the same gambit - a lineout followed by a driving maul - ended with Julian Montoya touching down. On the hour, Sanchez's replacement, Benjamin Urdapilleta, slotted over a penalty and it was back to 20-18.
Without a point in the second half, France were clearly rattled, their earlier fluency having deserted them. The last thing they needed was for Sebastien Vahaamahina to concede an extra 10 metres for shoving after a penalty. Urdapilleta stepped up and, unbelievably, Argentina were ahead by a point.
But there was a sting in the tale. Replacement Lopez, with possibly his first touch, attempted a drop goal from 30 metres that crept over the bar, but only just.
A frustrated Ledesma said: "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. A very good second half: we created many opportunities, scored, missed, missed two points."