Kylian Mbappe struck twice as France saw off bogey team Denmark 2-1 to book a place in the World Cup knockout stage.Mbappe, outstanding in France's opening Group D victory over Australia, was the star of the show again with two close-range finishes - his winner coming four minutes from time.Denmark, who had beaten France twice in the Nations League this year, fell behind after 61 minutes but soon levelled through Andreas Christensen.Mbappe's double puts him alongside Pele as the only players to score seven or more World Cup goals before their 25th birthday.The victory extended defending champions France's World Cup winning streak to six games.FULL TIME: France 2-1 Denmark Kylian Mbappe struck late on to secure France's spot in the knock-out rounds while Denmark are in big trouble heading into the final round of group games.