After having seen the Dutch team win their first group B match in the FIFA World Cup 2014, against the reigning world champion (Spain),
I was wondering what the highest win was ever against a reigning champion?
I searched for all games involving defending champions here. Spain's loss against the Netherlands is the biggest loss for any reigning world champion in terms of goal difference (1-5). The second biggest loss is by West Germany, who lost to France 3-6 in the third-place playoff of the 1958 World Cup. This is also the biggest loss in terms of goals conceded.