Future Real Madrid player Franco Mastantuono had moments of brilliance in River Plate's first Club World Cup match.

River overpower their Japanese opponents at Lumen Field under the Seattle sun, in an entertaining battle played out before a sparse crowd.

Real Madrid announced that they had completed the signing of Franco Mastantuono from River Plate in Argentina.The 17-year-old attacking midfield prodigy became the Merengues’ third