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87 knots is about one-and-one-tenth times as fast as a Fastball (baseball)
In other words, it's 1.1 times the speed of a Fastball (baseball), and the speed of a Fastball (baseball) is 0.91 times that amount.
(a.k.a. rising fastball, a.k.a. cross-seam fastball, a.k.a. heater, a.k.a. hummer, a.k.a. smoker; for four-seam grip) (major league average)
The average speed of major league fastball pitch is 81 knots. When up against the quickest professional fastball pitchers, a batter may have less than 0.4 seconds to react to a pitched ball.
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