One of the keys to success for last year's Pirates ballclub was its ability both to generate ground balls and convert them into outs. It all started with a pitching staff that had far and away the highest ground-ball rate (52.5%) in the big leagues. Featuring prominently in the repertoire of several Bucs hurlers, of course, was the sinker. As Tim Williams of PiratesProspects.com found when he investigated, those sinkers come in many different varieties. He provides a fascinating breakdown of the pitch from the perspective of Pirates players and coaches (including many staff members and catcher Russell Martin). Here's...

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