The Orioles promoted Prieto from High-A Aberdeen to Double-A Bowie on Monday, Roch Kubatko of MASNSports.com reports.
A two-week stint on the injured list earlier this season wasn't able to derail Prieto, who moves up to Bowie after slashing .340/.381/.619 across 105 plate appearances in 25 games with Aberdeen. The 23-year-old infielder showed impressive contact skills, as he struck out in only 15.2 percent of his plate appearances.