Harris will start in left field and bat seventh in Monday's game against the Reds.
Since being called up from Triple-A El Paso on Aug. 24, the left-handed-hitting Harris has been included in the lineup for five of the Padres' six matchups with righties. He's gone 6-for-12 with a double, a stolen base and three runs following his call-up and should hold down the strong side of a platoon in the corner outfield while he's swinging a hot bat.