This article is part of our Farm Futures series.Predicting when a player like Ronald Acuna or Gleyber Torres will be called up to make their big-league debut during the first five months of the season is an abstract activity that requires instincts, experience and a good feel for how a player's skills will play at the highest level. However, predicting which prospects and former prospects will be recalled when the calendar turns to September and rosters expand is more science than art.
In 90 percent of cases, a player's standing on the 40-man roster will open or shut the door on any conversation about a September callup. Very rarely does it make sense to add a player to the 40-man roster after Sept. 1. This is especially true of teams that are not contending.
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