Argentina moved ominously towards the top of Group F with a well-disciplined win over Nigeria.
The prolific Gabriel Batistuta rose majestically to head a second-half winner for the tournament favourites.
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Batistuta has now scored in every one of the three World Cups in which he has appeared and justified Marcelo Bielsa's decision to play him from the start.
The Argentines should have won the game by a far bigger margin, but were denied by the brilliance of Nigeria goalkeeper Ike Shorunmu.