Royals Kelvin Herrera probably dealing with 'lack of confidence'

Royals manager Ned Yost talked about the relievers who have stepped up in the midst of Kelvin Herrera's struggles after an 8-5 loss to the Twins at Kauffman Stadium on Friday, Sept. 8, 2017.
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Royals manager Ned Yost talked about the relievers who have stepped up in the midst of Kelvin Herrera's struggles after an 8-5 loss to the Twins at Kauffman Stadium on Friday, Sept. 8, 2017.