KnowraFastballLinked fromLinked fromThe 8 pages that link to Fastball, each with the reason it gives.All 8Related 5Narrower topic 2Compared with 1Roger ClemensNarrower topic: Clemens built his reputation around a high-velocity fastball.Tom SeaverNarrower topic: Seaver established his strike zone with a hard fastball before varying speed and movement.