DOHA, Qatar (AP)With five goals at the World Cup so far, Kylian Mbappe is living up to his reputation as the man best-placed to succeed Lionel Messi and Cristiano Ronaldo as soccer’s biggest star. Spare a thought then for Kyle Walker, who is set to mark the France striker when England takes on the defending champions in the quarterfinals on Saturday. "I do understand what I need to do and that’s obviously to stop him," the Manchester City right back said Wednesday.