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Daiki Iwamasa is an internationally capped player because he has played for Japan national football team at the 2010 FIFA World Cup, the 2011 AFC Asian Cup, the 2013 FIFA Confederations Cup, the 2014 FIFA World Cup, and the 2015 AFC Asian Cup. He has also played for Japan national under-23 football team at the 2008 Summer Olympics and the 2009 FIFA U-20 World Cup.