Edgy MD wrote: I don't know the process by which Harvey and deGrom make other pitchers better. It could happen, but that's some speculative science. It's notable that Wheels didn't curtail his walks. His strikeouts up-ticked a small amount, but so did his homers allowed. The real change is the batting average against. I think that's too frequently dismissed --- the McCracken thesis has holes and always did --- but it's obviously somewhat more luck-dependent than seeing his homers or walks go down or his strikeouts go up. babip is less useful for pitchers as I understand it. Also takes a little while to stabilize, so even smaller samples are somewhat less useful. But mostly, that's out of Wheeler's control. Though Tulo over Flores would definitely help it. I think the big difference is the K rate and HR rate. There's indication that HR rate has some measure of luck. Fly balls may leave the yard in a warm august with a breeze, but die in a cooler April. (xFIP takes this into account, whereas FIP doesn't, though Wheeler's xFIP and FIP are basically the same) His FIP went up slightly the second half, while his xFIP remained about the same. Harder to suddenly strike more guys out, that's usually somewhat indicative of skill, something I don't think it's unreasonable to expect out of Wheeler as he matures. You could wonder if it's because the Mets were mostly out of it in the second half, and he decided he should start attacking hitters more, with less to lose? But then you'd expect his BB rate to drop, the same if he improved on his control. I can't easily find 1st/2nd splits for pitch FX though, but he yielded a few more fly balls and a few less line drives in the second half. he stranded 5% more runners. What it boils down to is that he may have been roughly the same pitcher just happened to have the defense make a few more plays and strand a few more runners.