The Nationals optioned Adon to Triple-A Rochester on Friday.
Since rejoining the Nationals bullpen July 30, Adon has given up three earned runs in just 3.1 innings across four appearances. His Triple-A numbers haven't been spectacular either (5.40 ERA, 1.66 WHIP), but there's still a chance he returns to Washington later in the season if the Nats' bullpen depth runs thin.