This spring he posted a 4.50 ERA with 17 strikeout in 10 innings pitched over nine relief appearances. In 2018, he struck out 108 in 75.1 innings pitched over 39 relief outings with Single-A Tampa and Double-A Trenton. His 12.90 K/9.0IP ratio led all Yankees minor leaguers. Diehl was originally selected by the Yankees in the 27th round of the 2016 First-Year Player Draft.
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