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Shocking: 18-Year-Old Miguel Sime Jr. Blazes a 101 mph Fastball

Washington Nationals prospect turns heads during Spring Training

Miguel Sime Jr., Pitcher, 101 mph
Photo: MLB Instagram
Miguel Sime Jr., Pitcher, 101 mph
Photo: MLB Instagram
Miguel Sime Jr., Pitcher, 101 mph
Photo: MLB Instagram

MLB posted a new Instagram update on March 20, 2026, featuring Washington Nationals prospect Miguel Sime Jr. In the clip, the 18-year-old unleashes a 101 mph fastball. The caption read "That'll play" along with the hashtag #SpringBreakout, spotlighting his electric stuff. Fans flooded the comments with reactions like "sheesh" and "that's our boy!" as they praised the young pitcher's performance.