Steamer is pretty good. Here are a couple noteworthy things about it if you're unfamiliar: 1. They predict FIP, and they pretty much assume FIP = ERA. FIP is mostly driven by strikeouts, walks, and HR rate. There are players that consistently overperform or underperform their FIP, and Steamer does not pick up on it. It's a big debate whether or not Jungmann is one of those guys, but all of the analytics are predicting he's not and that last year was a fluke. 2. It takes about 2 years of MLB time to get any certainty in Steamer. If Davies and Garza have 3.00 FIP/ERA at the all star break next year, Davies projection will improve drastically but Garza will not move hardly at all. Steamer doesn't know what to do with a guy like Davies but it knows Garza very well at this point. 3. To answer the "how they work" question, they look at fundamental stats as opposed to "luck" based ones and use those to build a predictive model, then adjust for age and level shift. For example, Davies averaged about 8 K/9 in the MiLB, so they think that will drop to about 7 K/9 with the increased difficulty. That goes in to a data model along with other numbers to predict FIP and ERA. Garza is in his 30s so they pretty much predict based on his last 3 years with a tilt towards the more recent data, and knock off a little bit for getting older. 4. Steamer goes bananas for strikeouts, and we don't have many high strikeout guys. Example: They are predicting a career year for Strasburg because he's been a 10 K/9 guy for a few years. On the other hand you have Edinson Volquez who started the WS tonight, good ERA but he hasn't reached 7 K/9 in the last 2 years so Steamer says he's pretty much Matt Garza. I don't disagree with this, Volquez is not good and I think Steamer is correctly calling him fluky. It's important to remember that these predictions are baselines. 1-2 guys could improve their ERA by a full run through luck or mechanical improvements, but Steamer doesn't include luck or mechanical improvements. Conversely, 1-2 guys will probably get hurt or be terrible, but we can easily replace with a guy who will throw a 4.5 ERA so a lot of these predictions are kind of like the worst possible scenario in our case.