 Complete the following phrase:  After winning the All-Japan Amateur Boxing Championships in the first grade of university in 2004, he captured the bronze medal in the 2005 Asian Amateur Boxing Championships in Ho Chi Minh City, and the silver medal in the 2005 Kings Cup in Bangkok. After that, Murata went on an undefeated streak in his country, winning the All-Japan Amateur Boxing Championships also in 2007, 2009, 2010, and 2011. However, he was eliminated in the preliminary round by Nikolajs Grisunins at the 