Royals closer Kelvin Herrera talks about throwing his slider

Kansas City Royals pitcher Kelvin Herrera talks about throwing his slider this year.
Up Next
Kansas City Royals pitcher Kelvin Herrera talks about throwing his slider this year.

The slider has hurt Royals closer Kelvin Herrera, but here’s why he’ll keep throwing it

April 16, 2017 07:08 PM