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THE BOOK--Playing The Percentages In Baseball

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Friday, April 23, 2010

The 100 Pitches Limit

By Tangotiger, 09:42 AM

As long-time readers know, pitchers from Koufax/Drysdale time threw 100 pitches per start:

Except, here are the number of pitches thrown per start by the Dodger pitchers of yesteryear:
From 1958-summer of 1964, pitches per start:

107 Koufax
103 Drysdale
94 Williams
92 Podres
84 All other Dodger starters

The difference between today and fifty years ago is that pitchers back then would be removed from a game before even hitting 70 pitches a tremendous amount of time, and be allowed to stay in even past 130 pitches.  The overall average however is just like today!  Pedro Martinez for example has averaged 103 pitches per start, and that includes all his sub-100 averages in his later years.
...
Dodgers pitchers, 1958 through Aug 1964:

GS Pit StDev Over130 Under70 Pitcher
252 103 28 0.13 0.12 Drysdale
204 107 37 0.28 0.16 Koufax
129 94 35 0.13 0.21 Williams
198 92 29 0.07 0.19 Podres
289 84 32 0.07 0.33 Rest

Over130 means percentage of starts with over 130 pitches thrown.

Basically, they all agreed that the average should be 100.  They also agreed that if they pull pitchers early, they get to leave them out there longer in later starts.  This has now changed bit by bit, as JC shows us with this great graph:


(3) Comments • 2010/04/24 • SabermetricsHistoryPitchers
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April 23, 2010
The 100 Pitches Limit