Matsuzaka's Strikeout Rate: The Splits

Over lunch today, I happened to mention to Alex that after looking at Matsuzaka’s strikeout rate, I was reasonably optimistic that the Japanese pitcher would step up and perform closer to the level of a #2 starter. At which point he asked the question I should have: what were his first half/second half splits?

That, ladies and gentlemen, is why I don’t do this for a living.

Anyway, it’s always interesting to see what the league makes of a pitcher the second and third time around the league, after the players have the chance to see his stuff in person and the scouts have the opportunity to observe in detail his patterns, strengths and weaknesses. Particularly with a pitcher like Matsuzaka, who brings more than the usual arsenal of pitches to the table.

So without further delay, the numbers:

Time Innings Ks BBs K/9 BB/9
Pre All-Star 119.2 123 38 9.29 2.87
Post All-Star 85 78 42 8.26 4.45
Season 204.2 201 80 8.86 3.53

From which we can see that he did indeed tail off in the second half, but not as much as I expected, frankly, given the brutal nature of a couple of his second half starts. Frankly, if he does nothing but sustain the second half K/9 rate, I’m happy, though the walks need to come down. All in all, for a pitcher navigating his second turn around the tougher of the two leagues, it wasn’t bad at all.

In short, a closer look at the splits – as I should have done from the start – doesn’t dissuade me from my initial optimism. I think he’s poised for a step forward; maybe even a big one.