Ned Yost on Salvador Perez's grand slam: 'He went into battle mode'

Kansas City Royals manager Ned Yost discussed Salvador Perez's first career grand slam, which lifted KC to a 6-4 victory over the Boston Red Sox on June 21, 2017 at Kauffman Stadium.
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Kansas City Royals manager Ned Yost discussed Salvador Perez's first career grand slam, which lifted KC to a 6-4 victory over the Boston Red Sox on June 21, 2017 at Kauffman Stadium.