Riley is out of the lineup for Sunday's game against the Diamondbacks, Chad Bishop of The Atlanta Journal-Constitution reports.
It's the first day off of the season for Riley, who is batting .103 (3-for-29) with nine strikeouts in eight games since collecting three hits Opening Day. Mauricio Dubon will shift to the hot corner while Jorge Mateo picks up a start at shortstop in Sunday's series finale at Arizona.