Australia's Josh Risdon has earned himself a small - and potentially unwanted - slice of World Cup history in the Socceroos' 2-1 loss to France, becoming the first player penalised by the video assistant referee (VAR).
In other results from the busiest match day of the tournament so far, Denmark found a way to defeat Peru 1-0, Lionel Messi's Argentina were held to a 1-1 draw by debutants Iceland and Croatia accounted for a youthful Nigeria 2-0.
In Kazan, Les Bleus were the recipients of the first penalty ever awarded at a World Cup via the use of VAR when the referee adjudged Risdon brought down Antoine Griezmann in the box.
The French star slotted home the spot kick midway through the second half before Aussie captain Mile Jedinak replied with a spot kick of his own, after Samuel Umtiti inexplicably handled a cross when he should have used his head.
A draw appeared on the cards before a late deflected Paul Pogba effort looped onto the crossbar and in for the winner, with technology confirming it had crossed the goal line by the barest of margins.
It was an unfortunate result for the Socceroos, who face Denmark in their next match on Thursday, while Group C leaders France take on Peru.
The South Americans were denied on countless occasions in Saransk by Danish goalkeeper Kasper Schmeichel and squandered the second penalty to be awarded by the VAR.
Christian Cueva had the chance to put his country ahead on their first return to the world stage since 1982 but he sent his shot sailing over the crossbar.
And Denmark made him pay for his wastefulness when Yussuf Poulsen's clinical second-half goal secured the tight victory.
In a shock result, minnows Iceland stunned Argentina by holding them to a draw in Moscow.
Lionel Messi's penalty struggles continued when he had his second-half effort saved by Hannes Halldorsson, blowing victory for one of the title favourites.
It was one of 11 shots at goal by the five-time best player on the planet who was not at his best.
Earlier in the game, Sergio Aguero put the South Americans ahead before Alfred Finnbogason replied for the tiny Nordic nation, who could only command about 25 per cent of the possession.
Croatia knocked off Nigeria to sit on top of Group D before their meeting with Argentina on Thursday.
An own goal in the first half from Oghenekaro Etebo and a well-taken Luka Modric penalty sealed a comfortable win against a youthful Super Eagles side.
Nigeria play Iceland on Friday with a place in the round of 16 beckoning for the winner.