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That's right -- four seams spinning into the wind produce a more pronounced break than only two seams spinning into the wind. A curveball has all 4 seams at the top of the ball spinning into the wind, so it drops (usually the spin is a little skewed to one side, so it moves horizontally too.)
BTW, there is no such thing as a truly "rising" fastball. The pitch by that name just doesn't drop at the same rate as other pitches.
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