Nationals manager Dave Martinez said Adon will be called up from Triple-A Rochester to serve as the club's 27th man for Sunday's doubleheader with the Mets, Mark Zuckerman of MASNSports.com reports.
Since the doubleheader Sunday includes the resumption of Saturday's suspended game, Adon won't be eligible to pitch until the second game of the day, which will be a traditional nine-inning contest. He'll provide some length out of the bullpen for the second contest behind starter Jake Irvin.