While watching a football (aka soccer) game, you probably don't have a time to net-surf if you are really into it. Google shows this tendency by comparing the volumes of Google queries during World Cup matches against ordinary days.
It is no surprise that the volume of queries by Brazilians significantly drops during Brazil matches. The volume change from Brazil is so intense compared with other countries that it proves their royalty to football. Other European and South American power houses also show huge changes in queries.
Japanese royalty to football (we call it soccer in Japan) is developing, I would say. The fact that soccer is less popular than baseball or American football in US is evident from the dull drop of the queries during the matches.