Underwood struck out the side in a perfect fourth inning during Thursday's 5-3 win over the Cubs.

Underwood holds a career 7.9 K/9 while working predominantly as a starter in the minors, but his pitches have played up as a reliever in the big leagues and he has a 11/1 K/9 in 37.1 MLB innings following Thursday's appearance. Pittsburgh currently envisions using Underwood as a multi-inning reliever. Acquired from the Cubs in early March, the 26-year-old could get a look as a starter if he continues to pitch well given the uncertainty in the Pirates' rotation.

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