Manager David Bell said Monday that Diaz has made the Reds' Opening Day roster, Charlie Goldsmith of The Cincinnati Enquirer reports.
After being added to the Reds' 40-man roster over the winter, Diaz will bypass the Triple-A level entirely and make the jump from Double-A Chattanooga to the majors to begin the 2022 campaign. The 25-year-old righty posted a 3.83 ERA and 70 strikeouts over 42.1 innings for Chattanooga in 2021 while limiting opposing hitters to a .194 average. He'll likely start the season in a low-leverage role out of the bullpen, but he could quickly move up the pecking order in a Cincinnati relief corps lacking in upside arms.