Cristiano Ronaldo and Lionel Messi saw their World Cup dreams snuffed out on Saturday as French teenager Kylian Mbappe flew the flag for a new generation in Russia. Ten goals were scored on a gripping first day of the knockout phase as France progressed to a quarter-final tie against Uruguay but Messi and Ronaldo may have played their last games on football's biggest stage. In the first match, in Kazan, France roared back to beat Argentina 4-3, with 19-year-old Mbappe scoring twice in an electrifying display. Later in Sochi, Ronaldo -- who started the World Cup with a hat-trick against Spain -- was powerless to prevent Portugal slipping out of the tournament as Edinson Cavani scored twice in a 2-1 win to send the European champions home. The Paris Saint-Germain striker opened the scoring with an early header and curled a superb first-time shot past Rui Patricio to win the match after a Pepe equaliser.

Cavani, who forms a dangerous front-line pairing alongside Luis Suarez, later limped off, helped by Ronaldo, sparking fears for his World Cup future. Ronaldo, who will be 37 by the time of the next World Cup, was unable to keep Portugal alive despite incessant pressure from his side in the dying stages of the match. But Portugal coach Fernando Santos said the Real Madrid forward still had plenty to offer. "Cristiano still has a lot to give to football and I hope he will stay to help the young players grow and develop," he said. "We have a team with many young players and of course we all want him there with us." Uruguay coach Oscar Tabarez said Cavani had sustained an injury and it was unclear how serious it was. "As always we will bank on the strength of our team as a collective," he said. "That is our best chance against any adversary, and we know that France will be very tough indeed. "But we will try our best and look to impose our way of playing on them, using our strengths," he added. "We're here to play all seven matches, right up until the final, and we will see what happens."