Rosario hit .329/.377/.527 with six homers and 35 RBIs in 52 games at Fort Myers. The 21-year-old second baseman also homered Sunday and is ranked as the club's No. 6 prospect, according to MLB.com
"It's just something we were monitoring the last couple months, and they improved defensively and had good first halves offensively as well," Twins farm director Brad Steil said. "We thought they accomplished enough to move up to Double-A and tackle the next challenge."
The Twins also promoted outfielder Angel Morales from Fort Myers to New Britain and infielder James Beresford from New Britain to Triple-A Rochester.
Rhett Bollinger is a reporter for MLB.com. Read his blog, Bollinger Beat, and follow him on Twitter @RhettBollinger. This story was not subject to the approval of Major League Baseball or its clubs.