Duno was promoted to Double-A Chattanooga on Sunday.
Duno will make the leap to the Double-A level after producing a .250 batting average with 16 home runs, 47 RBI, 46 runs scored and two stolen bases over 242 at-bats in 65 contests with High-A Dayton so far this season. The 20-year-old is considered to the the Reds' top overall prospect, and he could be on track to make his major-league debut during the 2027 campaign.