Definition of "two-seamer" [two-seamer]

• A two-seam fastball. (noun)

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• "Though he appeared to struggle with his fastball earlier in the series, the velocity of his two-seamer increased inning by inning, eventually topping out on radar guns at 94 mph."
• "In a sign that Strasburg may be favoring his four-seam fastball over his two-seamer, opponents are hitting the ball in the air more than on the ground against him."
• "Storen fired a two-seamer low and inside, and it darted off the plate as Holliday swung over it for strike three."