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Impossible to answer with absolute certainty, but if you are strictly talking sidearmers and no submariners, that eliminates all but one.

Only Mets righty Joe Smith throws a true sidearm pitch and he sits 89-92 with his fastball.

If you include the submariners such as Byung Hyun Kim, Minnesota's Pat Neshek among others, the average probably drops a bit. Submarine pitchers tend to rely more on deception than velocity and often rush it up to the plate in the 85-88 mph range.

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Q: What is average MLB fastball speed?
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