Spain crashed to a hitherto unexpected 1-5 loss to the Netherlands, a team they had beaten four years ago in the World Cup summit clash to lift the trophy for the first time, in South Africa.
The group B encounter turned out to be quite a goal feast with Dutch veterans Robin van Persie and Arjen Robben, both 30, turning back the clock with two brilliant efforts each to leave the Spaniards dazed and in disbelief. This was the worst defeat suffered by a defending champion team in World Cup history.
It is worst defeat for Spain since its 6-2 thrashing at the hands of Scotland in 1963. It is also first time since 2002 that defending champions have lost the opening game.
France had lost to Senegal 0-1 in Seoul in 2002 but they were not mauled as badly as Spain were in this game.
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In other matches, Mexico shrugged off two contentious off-side calls in the first half to beat Cameroon 1-0 in Group A at Natal while Chile scored an impressive 3-1 win over Australia in another Group B contest at Cuiaba.
Even as the footballers were busy setting the tone for what is promising to be a cracker of a tournament, some sheen was lost when for the second day in a row, the referees hit the headlines for controversial calls.
For the second time in two days, a controversial penalty was awarded, Spain benefitting from that, while a couple of offside calls seemed too harsh, Mexico being the side at the wrong end of the stick.