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Iaquinta played 40 matches for Italy. He made his debut in 2005 and went on to represent his country at the 2006 FIFA World Cup, where he scored the winning goal in the quarter-final against Ukraine. Iaquinta also played at the 2008 UEFA European Championship and the 2010 FIFA World Cup. He retired from international football in 2010 with 40 caps and six goals to his name.