Duane Lee Underwood Jr. (born July 20, 1994) is an American professional baseball pitcher who is a free agent.

[4] For 2015, Underwood was promoted to the Myrtle Beach Pelicans, where he posted a 2.58 earned run average (ERA) in 73+1⁄3 innings pitched.

Underwood spent 2016 with the Tennessee Smokies, South Bend Cubs, and Myrtle Beach Pelicans, where he posted an 0–6 record with a 4.32 ERA.

[5] After the season, Underwood played for the Mesa Solar Sox of the Arizona Fall League and was added to the Cubs 40-man roster.

On June 25, 2018, the Cubs promoted Underwood to the major leagues to make his first start against the Los Angeles Dodgers.

On March 13, 2023, he pitched in relief versus Israel and retired every batter faced in the eighth inning, after José De León started and Yacksel Ríos, Edwin Díaz kept the perfect game intact, and Martín Maldonado caught on the way to a 10–0 win.

The contest ended when Maldonado scored on a walk-off hit in the bottom of the eighth inning that invoked the tournament's mercy rule.