Riley Cornelio Targets Control to Unlock Breakout Potential in 2027

Washington Nationals reliever Riley Cornelio showed promising rookie flashes in 2026, posting a 3.68 ERA over 36.2 innings with a 25% strikeout rate. Anchored by a 96.5 mph fastball, an elite 85 mph slider that generated whiffs over 50% of the time, and a newly introduced cutter, Cornelio possesses dominant stuff. However, his high 18.1% walk rate proved problematic in high-leverage situations. Controlling his walks will be the key to realizing his breakout potential in 2027.