Major League Baseball's postseason got underway on Tuesday with Game 1 of each of the four Wild Card Series. The winners of these three-game sets will then advance to MLB's more traditional playoff structure, beginning with the best-of-five divisional round.

The start of the postseason also means that the involved teams have to announce their rosters for the round. Unlike during the regular season, when teams are allowed to make transactions at their discretion, playoff rosters are treated with more rigidity. Teams can only replace players mid-series in the event of an injury, and anyone removed during a series must sit out the subsequent round too. MLB playoff predictions: Expert picks for Yankees vs. Red Sox, Cubs vs. Padres and every Wild Card Series Kate Feldman

In other wor

See Full Page