After the season the Yankees will have a tough choice to make. Do they allocate the payroll to sign Russell Martin, or do they let him walk and hope that Austin Romine can jump into the job? Since they do have the $189 million payroll goal, signing Martin might be difficult to justify. But, given his value to the team, especially on defense, they might find that a necessary investment. Just how valuable is Martin on defense? Anna Martin at ESPN’s Sweet Spot has a story today examining the various ways Martin works with his pitching staff. It includes the pitch-framing data we’ve discussed at length since last year, but it also talks about the more subtle aspects of the pitcher-catcher relationship. It’s definitely a quality read.