ARLINGTON, Texas — Kylian Mbappé and France haven’t trailed at all in this year’s World Cup. Neither has Spain with teenage sensation Lamine Yamal and clutch goal-scoring substitute Mikel Merino.Only one of those teams can make it to the final.France and Spain, both at their 17th World Cup, have met only once previously on soccer’s biggest stage. They play Tuesday at the home of the NFL’s Dallas Cowboys in the first of two powerhouse semifinal matches.After entering this tournament as FIFA’s top-ranked team, France has outscored its opponents 14-2. Mbappé, the 2022 Golden Boot winner, has eight goals to match Lionel Messi for the scoring lead this time, and is one behind the Argentina captain’s career record of 21 at the World Cup.“We are confident, of course, with the course we have done so far, and we have to be,” France midfielder Adrien Rabiot said. “But always with this humility that has characterized us since the beginning of the competition.”The 27-year-old Mbappé has 20 goals in his 20 World Cup matches, including one in the 2018 win over Croatia when he joined Pele as the only teenagers to score in a World Cup final. Coach Didier Deschamps said Mbappé is fine physically after exiting in the 77th minute of Les Bleus’ quarterfinal win over Morocco after scoring a goal.Yamal, who turned 19 on Mon …