Baltimore optioned Nunez to Triple-A Norfolk on Wednesday.
Nunez will head back to Norfolk after spending over a month with the big-league club. The 25-year-old had allowed just two runs in 8.2 innings over his last seven appearances, but he issued eight walks during that stretch. Nunez will cede his spot on the 26-man active roster and in the bullpen to right-hander Alex Hoppe, who was acquired from the Mariners on Monday.