Dunn is a 25-year-old AA-pitcher who has spent the season with the Chattanooga Lookouts. This season, Dunn, who has seen time as a starter, has worked as a reliever.
In 31 games, Dunn is 3-2 with a 3.79 ERA and eight saves in 40 1/3 innings. Dunn has struck out 54 while walking 16, while holding opponents to a .211 average (31 hits). Dunn was a 10th round pick out of the University of Texas in 1999.
The Reds are expected to use Jimenez, who batted .255 with seven homers and 26 RBIs in 73 games this season, as a utility man where he will see time at third base, second base and shortstop.
Dunn will likely report to the Birmingham Barons (AA) where he may replace recently traded Royce Ring as the closer.