But the Red Sox had some major roster questions looming even before Bregman went down, and Christopher Kiline of FanSided predicted Mayer's promotion will lead to another signific

Here's the emotional video of Triple-A player Marcelo Mayer hearing that he's been called up to play for the Red Sox.

In between games of Saturday's doubleheader with the Orioles, the Red Sox put Alex Bregman, who has a "significant injury" to his right quad, on the injured list and called up Marcelo Mayer, the No. 6 prospect in baseball and a key cog in their future.