Roberto Osuna on His “New” Slider

This post was written by our friend and colleague Rian Watt, who is the Editor in Chief at BP Wrigleyville. You can find him on Twitter here, or read more BP Wrigleyville posts here.  Late last Saturday afternoon, I was standing in the corner of the visiting dugout at Fenway Park, trying to work out […]

By Rian Watt