Asamoah Gyan scored an extra time goal to nail Ghana's 2-1 victory over the United States in the World Cup second round here on Saturday.

The scorer on Ghana's two group stage penalty shots won an aerial challenge with Ashley Cole and kept his balance to blast home three minutes into extra time.

"I am the happiest man in the world," Gyan exclaimed after the final whistle. "In 2006 we made the second round, now we have gone a step further. We have made Ghana proud and the whole of Africa proud."

Asamoah Gyan (C) of Ghana celebrates with teammates after scoring in extra time during the 2010 World Cup round of 16 soccer match against the United States at Royal Bafokeng Stadium in Rustenburg, South Africa, on June 26, 2010.

For the rest of extra time, the United States pressed hard and created numerous chances, which were either ruined by Ghana keeper Richard Kingson or the Americans' inabitity to finish the attack.

"I really felt when we got to 1-1 there were some chances for us," United States coach Bob Bradley said. "Early in the overtime we go down again early. At that point, with everything we put into the game early, we didn't have enough after that."

The Black Star controlled the first half and the speedy Americans held an upper hand in the second.

Kevin-Prince Boateng put Ghana ahead in the fifth minute and Landon Donovan pulled the Americans back on the same footing with an half-time penalty kick.

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