Aroldis Chapman
McHugh made the transition to a relief role in 2018, appearing in 58 games. He finished with an ERA of 1.99 in innings, striking out 94. In 2018, he had the third-lowest swing rate for his in-strike-zone sliders of any pitcher in baseball (43.9%), behind only Aroldis Chapman (42.5%) and Robert Stock (43.1%).