Assertion: seam fastball | /r/HasProperty | thrown with ball
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Source sentences:
text: In context|baseball|lang=en terms the difference between sinker and fastball is that sinker is (baseball) any of several high speed pitches that have a downward motion near the plate; a two-seam fastball, a split-finger fastball, or a forkball while fastball is (baseball) a four-seam fastball, which is a backspin pitch thrown with a ball gripped in the direction to cause four of the seams of the ball to cross the flight path and released with roughly equal pressure by the index and middle fingers.