While he's still hitting pretty well, it may be time to realize that, at this point in his career, Jorge Posada is better suited as a designated hitter. One stat that may bear that out is Catcher's ERA (CERA). The stat is fairly simple: it breaks down the pitching staff's ERA when each catcher is behind the plate.

Posada sports a MLB-worst 6.46 ERA. With Francisco Cervelli (who I am still shocked to see in the majors), the staff is pitching to a 4.45 ERA.

Cervelli has already coaxed a shutout from CC Sabathia, as well as the best start of the season from A.J. Burnett.

What do you think? Is it time for the Yanks to switch catchers?