Well, Uruguay lost against Hungary, Austria, Yugoslavia, Soviet Union, Germany (3), Sweden(2), Brazil, Argentina, Netherlands(2), Denmark(2), Belgium, Italy. So they lost 6 matches against world cup winners. Apart from the one time losses against Brazil and Argentina, they really don't like to play against European teams. Unless I am missing something they managed to win four matches against nations that won the WC at least once (Brazil x1, Argentina x1, France x1, England x1). Funnily none of these nations had won the WC at the time they lost to Uruguay. But that doesn't mean their record is bad. Maybe I should try to analyze the records of all 8 different world cup winners against each other. But it's probably not very meaningful, because of the low number of matches.