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Friday, August 01, 2008
Joba
In his MLB career, including the post-season, Joba Chamberlain has faced 248 batters as a starter and 201 batters as a reliever (excluding IBB and SH).
69K/21BB, with 2 HR and 2 HB as a starter and 68K/20BB, with 2 HR and 2 HB as a reliever. Do we even need to go any further here? Take away 1 K and 1 walk as a starter, and the lines are identical!
The main difference, as is the case for most reliever/starter comparisons, is that a pitcher, as a starter, allows more BIP (balls in play) for his fielders. Taking away his 94 K, BB, HR, HB as a starter, and he allowed 154 BIP out of 248 batters faced (62%). As a reliever, he had 92 non-BIP, meaning 109 BIP out of 201 batters, or 54%.
As a starter, he has allowed 44 singles, 6 doubles or triples, and 1 batter to reach on error (ROE), out of 154 BIP. That’s a .331 batting average. If you count the 1B and ROE as “0.9” and the extrabase hits as “1.3”, that gives you a (weighted) .314 batting average. That is, alot of his hits allowed as a starter have been singles, so that .331 average is “empty”.
As a reliever, 21 singles, 8 doubles or triples, and 1 batter to reach on error on 109 BIP. That’s a .275 batting average. His (weighted) batting average is: .277.
As you can imagine, the difference between a .314 and .277 batting average after 109 chances is virtually meaningless (just 4 hits, and 1 SD is 5 hits).
All of the yappers who said that it was better to keep Joba as an 8th inning guy because he was a known quantity there, and an unknown as a starter, please expend as much energy in saying how very wrong you were.
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