The Nationals optioned Adon to Triple-A Rochester on Monday.
Adon posted a 6.45 ERA and 1.63 WHIP over 12 appearances (10 starts) with the Nationals a season ago, but with the Washington rotation in a better spot from a health standpoint heading into spring training than it was late in the 2023 campaign, the right-hander won't earn a spot on the Opening Day squad. He's still likely to stay stretched out on the farm as a member of Rochester's rotation and will be available to make spot starts for the big club whenever injuries test the Nationals' rotation depth.