How third baseman Alex Bregman has tried to help top Red Sox prospects Roman Anthony and Marcelo Mayer since arriving as a free agent.

Marcelo Mayer and Roman Anthony‘s Major League Baseball debuts are a matter of when and not if. And with the Red Sox sitting at .500 and struggling at times at the plate, many have wondered whether one or both of Boston’s top prospects should get the call to the big leagues sooner rather than later.

Anthony, 20, is the No. 1 prospect in baseball. His overall numbers and his underlying metrics suggest that he's ready for the big leagues, but he's still being stashed in Triple-A. Why?