Many of these are proprietary, so you can find similar fonts, but not the exact one.... do you have a specific team you're looking for? Here's some to get you started..
Here's a similar style, although not the same, as you'll see:
Hobo : Style Details : MyFonts
Another similar font, from a design who has worked for the Yankees:
Mirage font family : MyFonts
timtastic! fonts or
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