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THE BOOK--Playing The Percentages In Baseball

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Thursday, June 16, 2011

How low a Leverage Index should cause an immediate removal of a starting pitcher?

By Tangotiger, 09:54 AM

Crashburn presents various scenarios.

On one extreme is if the visiting team takes a huge lead in the first inning… do you really want to send your ace out there?  And how long do you want to keep him in the game?

There are two major considerations:
1. The preparation of the starting pitcher for that day.
2. The burning of your bullpen.

For #1, how tough is it on a starting pitcher to not actually pitch the day he was expected to pitch, and then be held back for one or two days?  How much will this drop his true talent level for the next game?  If he turns into a replacement level pitcher in the next game, well, then you may as well use him in the current game instead, since in both cases, he’ll be useless.

For #2, as much as most relievers are fungible, they still can’t be sent out there at will every game.  You still need to manage them as humans with limited number of bullets.

Having said all that, if the LI is under 0.1, and the starting pitcher has thrown 70 pitches, and there’s 5 innings to go, is THAT the point you do the switch?

(Consider the starting pitcher to be an ace, like Doc or Verlander.)

Do NOT give such answers:
- case by case
- can’t come up with rules of thumb
- can’t blank

Those aren’t helpful.  Be helpful, be creative, apply some critical thinking.  Imagine you are writing a thesis.

(9) Comments • 2011/06/17 • SabermetricsIn-game_Strategy
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June 16, 2011
How low a Leverage Index should cause an immediate removal of a starting pitcher?