For me, one of the most memorable pitches of the past few seasons is the fastball that Sergio Romo threw by Miguel Cabrera to clinch the 2012 World Series. On its own merits, Romo’s fastball isn’t particularly good, and for that reason, everybody watching figured Romo would throw a slider. For that reason, Romo threw an effective fastball, and it was the biggest pitch of his life — and it turns out every pitch is connected and one never has to really stand on its own merits. Romo succeeds with his fastball in the way that Tim Wakefield succeeded with his fastball: He uses the pitch to take batters by surprise, because his primary pitch is way better.
Game theory is a complicated concept, but pitch mixes make it simpler to grasp. Say you have a pitcher with an unbelievable changeup. Even though the changeup is his best pitch, it wouldn’t make sense to throw it 100% of the time, because a key component is surprise. Therefore there exists some optimum frequency with which the pitcher would throw something else, even if “something else” is something a lot worse. Because of the changeup, in theory, it wouldn’t look a lot worse in context. A hitter should never be able to know what’s coming, unless the pitcher is Mariano Rivera, who now is retired.
And this brings us to the current matter of Al Alburquerque, who has a slider. He has a very good slider, and he’s thrown it a whole bunch.
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