Algeria goalkeeper Farouzi Chaouchi's error 11 minutes from time handed Slovenia a crucial 1-0 victory in their Group C match at Polokwane.
Less than 24 hours after England's Robert Green had let Clint Dempsey's shot slip from his grasp in the 1-1 draw in the group's opening game, Chaouchi produced a similar howler.
Slovenia captain and former West Brom midfielder Robert Koren's 25-yard shot was not particularly venomous but the Algeria goalkeeper allowed it to bounce up off his shoulder and into the net.
Only moments before that the Africans had been reduced to 10 men when substitute Abdelkader Ghezzal's needless handball resulted in a second yellow card.
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