Lansing Lugnuts
Carreño split 2009 between the Doubledays and Lansing Lugnuts, going a combined 3-4 with a 3.28 ERA in 16 starts. With the Dunedin Blue Jays in 2010, he went 9-6 with a 3.73 ERA in 27 games (25 starts). He struck out 173 batters in innings.