The Nationals optioned Granillo to Triple-A Rochester on Tuesday.
After giving up four earned runs over two innings in Tuesday's loss to Minnesota, Granillo now owns a 9.64 ERA and 2.25 WHIP over 9.1 major-league innings. He'll attempt to get back on track in Triple-A, though he has also struggled with the Red Wings (10 ER, 5.0 IP).