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Andrija Prlainovic scored five times to lead a relentless Serbian attack, while in the back goalkeeper Slobodan Sporo made a string of big saves to deny the Hungarians.

Hungary came into the London Games riding a 17-match Olympic unbeaten streak dating back to the 2000 Sydney Games.

In Group A, Croatia used a late surge to pull away for an 8-6 win over Greece, Spain scored an easy 14-6 victory over Kazakhstan behind five goals from Filipe Perrone Rocha, and Alex Giorgetti scored twice to lead 2011 world champion Italy past Australia 8-5.

The 12-team field is broken down into two groups of six for the preliminary stage, and the top four teams from each group advance to the knockout round.