Welcome to the 2021 positional preview series. Over the next seven days, we will be looking at each position group — catcher, corner infield, middle infield, corner outfield, center field, starting pitchers, and relief pitchers — throughout the organization. For each installment we will take a look at the projected starter(s), the options to come off the bench, the depth pieces who will be waiting at the Alternate Site/at Triple-A, the top prospect, the sleeper prospect, all the rest of the prospects for each position, and where they stand in the division. We start things off today looking behind the dish.