Graterol will be promoted to Triple-A Rochester on Sunday, Betsy Helfand of the St. Paul Pioneer Press reports.

The 20-year-old has been dominant at the Double-A level this season with a 1.78 ERA and a 49:21 K:BB in 50.2 innings. He'll get the chance to work against some more developed hitters at the Triple-A level, but this could also be a sign that Minnesota may call him up in September to help their bullpen.

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