 As a participant for the United States national baseball team in the 2017 World Baseball Classic, Miller gave up home runs to Nelson Cruz and Starling Marte of the Dominican Republic in Team USA's first loss of the tournament.Miller earned the first major International Championship of his baseball career when Team USA defeated Puerto Rico 8−0 in the final on March 22, 2017.Both attempting to lead sequences against hitters with the fastball and a myriad of mechanical issues limited Miller's success as a starting pitcher early in his major league career.