The move protects the 22-year-old from being selected by other teams during the upcoming Rule 5 draft. Adon spent 2020 at the Nats' alternate training site after posting a 3.86 ERA, 1.30 WHIP and 90:44 K:BB over 105 innings at Low-A Hagerstown in 2019.
Nationals' Joan Adon: Added to 40-man roster
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