00:01An 18-year-old prospect just delivered one of the most unforgettable moments of MLB preseason.
00:07Miguel Seim Jr., pitching for the Nationals, fired a 100.8 mph fastball on a full count after battling back
00:14from 3-0.
00:16J.J. Weatherholt swung so hard he spun and lost his helmet, creating a viral moment that perfectly captured the
00:22raw power of Seim's pitch.
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