Sources: Boston Red Sox to call up prospect Marcelo Mayer

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The Boston Red Sox are calling up infielder Marcelo Mayer, the No. 6 prospect in baseball and a central part of their future who they hope can play a role in their push for a postseason berth this year, sources told ESPN.

The 22-year-old Mayer, who has excelled at shortstop as he ascended through the Red Sox's farm system after they took him with the No. 4 overall pick in the 2021 draft, is likely to get playing time with All-Star third baseman Alex Bregman expected to land on the injured list after leaving Friday's game with right quadriceps tightness.

At Triple-A Worcester, where Mayer was hitting .271/.347/.471 with nine home runs and 43 RBIs in 43 games, he played four…