Adon has secured a spot in the Nationals' Opening Day rotation, Mark Zuckerman of MASNSports.com reports.
Adon made his major-league debut in the final game of last season, allowing two runs on six hits in 5.1 frames against the Red Sox while striking out nine and walking three. Prior to that, he'd only made three starts at Double-A and one at Triple-A, so he doesn't have much experience facing high-level hitters. He doesn't come with a ton of prospect pedigree, but the Nationals clearly like what they see in the 23-year-old given how quickly he's ascended through the levels.