The shot was administered Saturday. Mayer said there’s a “100 percent” difference in his wrist since the injection.

Red Sox rookie infielder Marcelo Mayer is in wait-and-see mode when it comes to the wrist injury that has sidelined him since July 24, but he’s doing everything possible to return by the end of the season.

The Boston Red Sox's season has been a roller coaster full of key injuries. One of their injured players' seasons could be over.