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BEIJING, CHINA - MAY 25: John riel Casimero (R) of Philippines punches Amnat Ruenroeng of Thailand in the head during their IBF World Boxing Championship at Beijing Olympic park diamond stadium on May 25, 2016 in Beijing, China. (Photo by Lintao Zhang/Getty Images)

BEIJING, CHINA - MAY 25:  John riel Casimero (R) of Philippines punches Amnat Ruenroeng of Thailand in the head during their IBF World Boxing Championship at Beijing Olympic park diamond stadium on May 25, 2016 in Beijing, China.  (Photo by Lintao Zhang/Getty Images)