I'll respond to your paragraphs one by one. (1) You suggested that there were two reasons Murphy's OPS shouldn't be taken seriously, (a) BABIP and (b his Home/Away splits. My point was that it is ironic/inconsistent to use (a) to criticize my point when (a) also undermines your criticism (b. And it does. As you admit, the home/away splits, which are not minor, are definitely driven largely by BABIP. So if you think BABIP is a good criticism of his OPS because it shows it was luck driven, then it also shows his home/away splits are also luck driven (or unlucky driven for the away splits), and therefore not sustainable. You can't have it both ways. (2) His BABIP was league average away, but it wasn't at home, which is about half his plate appearances. So are you saying to find his true BABIP we should take his home/away splits and choose the lower one? Is that how you calculate "true BABIP" for other players? Of course not. Do you think Yankee stadium leads to a .417 v. .288 BABIP split from home and away? If so, then wow, Yankee stadium is a really really friendlier park for singles and doubles, which were most of his hits. Also, note that Murphy's ISO was much higher away than it was at home (.159 v. .105). This just goes to show you that these differences between home and away based on even smaller samples than his overall numbers last year are being driven by short-term luck/unluck, not Yankee stadium. The most likely outcome is that his "true BABIP" is somewhere in between .288 and .417, and yes, I admit, probably a bit lower than the .357 BABIP he had last year although not .288. Which brings me to my third point. (3) Mauer is related because I started by comparing Mauer to Murphy and making light of those who call for Mauer to catch but are upset that we traded for someone to catch who had a better OPS than Mauer last year by .15. You criticized this point originally (surprisingly, since I don't think you are one of the ones calling for Mauer to catch again, so I don't know why you would be defensive, but maybe you do think Mauer should catch again afterall). That is why Mauer is relevant. And yes, saying that the worse half of Murphy's splits is almost as good as Mauer's overall performance is relevant and interesting because it shows that even under your strongest assumption (that Murphy will regress to his away splIts -- which I think is pretty unlikely), he is still pretty close to as good as Mauer. Also, I don't agree that it is "widely believed" that Mauer underperformed. According to whom? According to previous years? Sure, but he is a 32-33 year old still obviously dealing with the lingering effects of a concussion. Another word for "underperformance" may just be "decline." I'm not a Mauer basher, and I hope he returns to his 2013 numbers next year, but I really don't think we should count on it.