The World Cup's magic is that anyone can beat anyone on the day. These are the results that stopped the football world in its tracks — underdogs and debutants toppling giants on the biggest stage.
Part-timers stunned the English in one of the sport's original giant-killings.
Cameroon beat the defending champions in the opener with nine men at the finish.
Debutants Senegal toppled the reigning world champions in the opening match.
The eventual champions were beaten by Saudi Arabia in their opening game.
The pattern repeats across the decades: a fearless underdog, a complacent favourite, and a result that reshapes a tournament. Several of the most famous came in opening matches, when champions-elect were caught cold.