What is the winning percentage of all mlb pitchers following a win? example - what is the chance of a pitcher winning their next start if they are coming off a win?
by 
dissnme
ANSWERS: 2
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I would imagine it has to be close to 50%.
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Logically, over a long enough time scale, it has to be 50%, or at least 50% of all games that do not result in a non-decision for a starting pitcher, so perhaps nearer to 40%. But it must, over the long term, tend towards that figure simply because for every game played there is 1 winner and 1 loser. Any short-term winning or losing trends by pitchers at one end of the ability spectrum will be cancelled out over time by corresponding opposite trends by pitchers at the other end of the spectrum. Of course, the 2nd question you ask, "what is the chance of a pitcher winning their next start if they are coming off a win?", is not at all the same as the first one you ask. When assessing the chances of a pitcher to win a particular match-up you can do nothing but assess it on its merits. If Jake Peavy matches up against Kip Wells, I'm going to back Peavy, even if he lost his last start against Brad Penny and Wells won his last start against a Royals rookie... it's just common sense, this "winning %age of all pitchers following a win" stat is too meaningless to matter one bit.
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