The reigning champions may need to continue outperforming their xG to overcome Spain’s superb defensive record The World Cup final will feature the champions of South America and Europe for the first time. Argentina and Spain sit first and second in Fifa’s world ranking of men’s international teams. Opta’s supercomputer rated Luis de la Fuente’s side as favourites to win the tournament, with their opponents on Sunday deemed fourth likeliest. Both systems had England and France in their top four…