Deduno, 0-0 with a 5.06 ERA, has had brief stints as a relievers with the Colorado Rockies (2010) and San Diego Padres (2011). But in their season-long quest for starting pitching, the Twins are trying out the 29-year-old Deduno as a starter. His first big-league start came on July 7, when he went 5.1 innings and gave up three earned runs in a no decision against the Rangers.
In Triple-A Rochester this season, Deduno started nine games and went 1-2 with a 2.14 ERA. He had 46 strikeouts in 42 innings.
The Orioles, who are currently ahead of both the Tampa Bay Rays and Boston Red Sox in the AL East, will start Zach Britton. Sidelined with a shoulder injury, Britton is making his first major league start of 2012.
First pitch is scheduled for 7:10 Central.