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THE BOOK--Playing The Percentages In Baseball

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Thursday, August 06, 2009

Could it be correct to have a lefty pitcher pitch to a righty batter?

By , 02:24 PM

Even if they both have have a normal platoon ratio and the righty pitcher is a better pitcher (after adjusting for the platoons)?

I was watching the MIN/CLE game today and it was a one run game in the 8th inning.  MIN brought in Chris Gomez to run at first base with one out.  He was clearly looking to steal a base. CLE took out their lefty pitcher, Sipp, and brought in Smith, a RHP, to pitch to Cuddyer, a RHB.  Normally this is the correct move of course because of the platoon advantage.

However, what if the difference in the chances of a successful SB were significantly different off the RH and LH pitcher, which it usually is?  Could it be that it is correct to leave in the LHP to prevent the SB?  Obviously it depends on the expected success rate versus the righty and the lefty and the catcher behind the plate, as well as the chances that the runner will even attempt a SB.  In this case, Gomez is extremely fast but he has poor base stealing numbers.

Anyone want to do some analysis on this?

(6) Comments • 2009/08/06 • SabermetricsBaserunning
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August 06, 2009
Could it be correct to have a lefty pitcher pitch to a righty batter?