The Cubs’ Rotation Got Fixed
On July 20th, my colleague Craig Edwards wrote a piece for this site entitled “The Cubs Are on Pace for Their Worst Rotation Ever” in which he argued — in accordance with all observable objective reality at the time — that the Cubs were on pace for their worst rotation ever. It wasn’t an especially difficult case to make. At the time Craig published, the Cubs’ rotation — which still featured rather too much of Tyler Chatwood — had produced just 3.0 WAR as a group, which is the kind of figure that, as a measure of collective performance through nearly three months of a major-league season, is apt to make one physically recoil regardless of how you feel about pitcher WAR’s usefulness as a measure of overall performance. It was bad.
Since then, however, the Cubs’ rotation has been rather good, and that fact is the point of this article. Consider the following table, which presents the Cubs’ rotational performance up to and including the 20th of July, and also after that date (MLB ranks in parentheses):
Period | IP | K% | BB% | ERA | FIP | xFIP |
---|---|---|---|---|---|---|
Pre-Craig | 510.2 (25) | 19.6% (21) | 10.8% (30) | 4.02 (12) | 4.75 (25) | 4.58 (24) |
Post-Craig | 295.2 (10) | 21.8% (15) | 8.0% (22) | 3.65 (10) | 3.67 (9) | 3.92 (12) |
You will agree, I hope, that the Cubs’ rotation has been better since Craig said they were bad, and will therefore turn your attention with me to why. Here is one reason: it has much less Tyler Chatwood in it. Here is another: it has much more Cole Hamels. These might sound like blithe (and, in Chatwood’s case, rather mean) things to say, and to some extent they are. But they are also true.