- Jayson Stark, Senior Writer, ESPN.com
Editor's note: Hot Stove U. is a six-week course devoted to higher learning, a series consisting of 30 need-to-know topics for 2010.
Once upon a time in baseball, it was easy to find a great pitcher to pitch the sixth and seventh inning. He was known as
Tonight's starting pitcher.
But nowadays? Uh, it's not quite so easy. Is it?
Here in modern, 21st-century baseball, those innings are being pitched by the scariest, least reliable, least predictable members of any team -- the middle relievers. So in theory, those middle relievers can make a team's whole season.
Or they can get everyone fired except the grounds crew.
So if you're drawing up a formula for how to win, you obviously need to accumulate as many effective middle-relief kind of guys as possible, right? Right. Every GM knows that. But here's what they don't know:
How the heck they're supposed to do that.
Just this week, I asked a very sharp, very experienced general manager if, after exhaustive study on this exact subject, he now knew how to evaluate middle relievers.
"No," he replied succinctly, "because no one does."
And he's right. Middle relief is, by far, the most volatile position in baseball. And we're about to prove it.
Wondering what the most volatile position in baseball is nowadays? Hands down, it's the performance of middle relievers from year to year.