So long, Isaiah Campbell. The Red Sox demoted the struggling reliever back down to Worcester ahead of the pivotal series with the Yankees this weekend. Richard Fitts, who has been a starter all season will make his way back up to the big leagues and pitch out of the bullpen.

Two teams with plenty still to prove. Here's why this week's Red Sox-Yankees series will have postseason implications.

Of course neither the Yankees nor the Red Sox are in first place as they begin a four-game series on Thursday night at the Stadium. Somehow this still feels like the beginning of an abbreviated

For MLB insider Joel Sherman, he believes the four-game set is a “ real measuring stick ” for the Yankees for five reasons. The Red Sox are 41-24 at Fenway Park. So should the two teams meet in the Wild Card series, the Yankees would benefit by having the games in the Bronx and not in Boston.