Lionel Messi and Cristiano Ronaldo were sent packing from the World Cup on Saturday as French wonderkid Kylian Mbappe made his case to follow in their footsteps as a Ballon dOr contender. Mbappe scored twice as France edged a World Cup classic 4-3 thriller over Argentina to possibly end Messis last attempt to win a major international trophy. Ronaldo will also miss out on the Golden Boot as he couldnt breakthrough Uruguays solid defense as the South Americans prevailed 2-1 in Sochi. Here, AFP Sports looks at three things we learned at the World Cup on Saturday:Move over Messi, Mbappes time is now After three ponderous group games, Frances World Cup needed a spark and Mbappe provided it in style. He became the first teenager to score twice in a single game at the World Cup since Pele in 1958 as his quick-fire double blew away Argentina in a seven-goal thriller in Kazan. This was a statement performance from the man who cost Paris Saint-Germain 180 million euros last year and has long been circled as a future star. There were the two smart finishes, not to mention a storming run that earned France a penalty for Antoine Griezmanns opener. In the 31-year-old Messi, one extraordinary talent bowed out of perhaps his last World Cup. In Mbappe, another announced his arrival in style.Cavani comes good Not to be outdone by his club team-mate Mbappe, Edinson Cavani produced two stunning finishes of his own to beat European champions Portugal. Cavani tapped home from close range into an empty net to seal a 3-0 win over Russia to cap a perfect group stage for Uruguay. However scrappy a finish, the confidence of getting off the mark transformed Cavani from a striker struggling for form in the first three games in Russia back into the man that netted 40 times for PSG this season. He started and ended the move that put Uruguay into an early lead by powering home Luis Suarezs cross on seven minutes and won the game with an even better curling effort from 20 yards.Uruguay quiet contenders Cavani hobbled off injured 15 minutes from time in Sochi, but providing his fitness isnt in doubt for the last eight meeting with France on Friday, Uruguay are emerging as contenders. Despite conceding for the first time in Russia, the best defense in the competition, led by Atletico Madrid duo Diego Godin and Jose Maria Gimenez, kept Ronaldo quiet. Godin and Gimenez will know better than most how to muzzle club team-mate Griezmann and wont allow Mbappe the space in behind to use his devastating pace like Argentina did. At the other end of the field, Suarez played provider for both Cavanis goals and looks intent on erasing his World Cup demons from four years ago when a bite on Giorgio Chiellini saw him slapped with a four-month ban.