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It may matter 'less' at the lower end than at the top end (although I'm not entirely sold), but to insist that it doesn't matter at all is beyond silly.
Jamie Moyer average fastball '02-'03: 82.8
Jamei Moyer average fastball '04-'06: 81.7
Jamie Moyer average fastball '-07-'09: 81.2
The loss in fastball velocity from '03 to '04 marked the end of Jamie Moyer as TOR starter in the AL. But velocity doesn't matter in that range right?