Neurotik, if I may bust out my inner stat geek, I’d like to argue that if you’d take Mussina, Brown, and Vasquez over Martinez, Schilling, and Lowe, you’d be making an enormous mistake. Here are the raw numbers for each of the six over the last three years (note that Lowe’s numbers are for the last two years only, as he spent the bulk of 2001 as a relief pitcher).
BOS -
P. Martinez: 25.7 starts, 167.6IP, 11.1K/9, 2.0BB/9, 2.29ERA
C. Schilling: 31.3 starts, 228.0IP, 10.6K/9, 1.4BB/9, 3.05ERA
D. Lowe: 32.5 starts, 211.5IP, 5.1K/9, 2.6BB/9, 3.53ERA
NYY -
M.Mussina: 32.7 starts, 219.7IP, 8.1K/9, 1.8BB/9, 3.53ERA
J.Vasquez: 33.3 starts, 228.2IP, 8.3K/9, 2.0BB/9, 3.52ERA
K.Brown: 20.3 starts, 130.1IP, 8.1K/9, 2.9BB/9, 3.28ERA
All right. Now, we can safely assume that the numbers of the three pitchers who’ve spent the last three years in the National League - Vasquez, Brown, and Schilling - are likely to increase at least slightly, given that they will now face American League lineups and be deined the easy out of the pitcher in the NL. The AL League ERA was 4.53 in 2003, vs. 4.28 in the NL, a difference of around six perecent. Brown, in particular, is coming from one of the best pitcher’s parks in baseball, so we might expect his numbers to inflate most of all. In order to try to demonstrate this effect, I’ve increased the ERAs of Vasquez and Schilling by 3%, and of Brown by 4% (obviously, I’m estimating). With that in mind, our league adjusted ERAs are now 3.14 for Schilling, 3.63 for Vasquez, and 3.41 for Brown.
Both Martinez and Brown have had substantial injury problems and missed a lot of starts, so I’m comfortable calling that aspect of the staff comparison a wash; if either of them misses a good deal of time and the other doesn’t, the balance swings decisively toward the uninjured rotation. Derek Lowe is clearly the worst pitcher of the six; his ERA resembles Vasquez’s, but Vasquez has strikeout numbers that suggest improvement or at least steady performance. Lowe’s peripheral stats suggest that he may yet backslide.
The problem is this: whoever you match up against Lowe is better than he is, yes. But whichever two Yankee pitchers you choose to match up against Schilling and Martinez, the Boston pitchers are way, way better. Martinez isn’t just better than Mussina, he’s a run and a third better, and strikes out three more guys per nine. Kevin Brown is a very good pitcher, but Schilling will pitch better. His strikeout numbers are far superior to Brown’s, and Brown walks a full batter and a half more per nine. Throw Vasquez into the mix if you want, but neither his actual performance nor his peripherals can match either those of Martinez or those of Schilling. And Lowe simply isn’t so much worse than the worst Yankee pitcher that the overall mix can favor the Yankees.
If I have the energy and time, I might look into the bullpens, but that seems like a difficult endeavor given how wildly relief stats seem to vary from year to year.