He'll play left field and bat sixth in the lineup.
Ludwick has been out since Opening Day when he tore cartilage in his right shoulder during a head-first slide into third base against the Los Angeles Angels. Ludwick had shoulder surgery and couldn't swing for three months.
During a rehab assignment, Ludwick went 6 for 44, but finished with a four-game hitting streak. Ludwick says coming back has been "a lot tougher than I thought it would be."
Also, Cincinnati optioned OF Derrick Robinson to Triple-A Louisville. Robinson was hitting .254 with seven RBIs.
In 2012, Ludwick hit .275 with 26 home runs and 80 RBIs.