This article is part of our MLB Barometer series.There are usually a few parts of the MLB calendar that lead to a cluster of prospects arriving in the big leagues together.
The door can open on the first day of the season in which a player can be brought up without accruing a full year of service time (this year, it was April 13).
In other instances, the early weeks of June become a busy time for promotions as Super Two concerns begin to fade.
Of course, roster expansion in September on the first day of the season's final full month is the largest swarm of new talent into the player pool, but many of those players are not prospects, as much as they're guys who could be auditioning for roster spot for the following season.
With the perfect storm of injuries and attrition, a nice group of young pitchers has arrived with regular chances to start for their respective clubs over the last couple of weeks.
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