Motter is starting at shortstop and hitting ninth in Tuesday's game against Houston, Shannon Drayer of MyNorthwest.com reports.
Jean Segura was placed on the disabled list Tuesday with a strained hamstring, so Seattle turned to Motter to fill in. Motter's major-league experience has been fairly limited to this point. Over the past two seasons, he's played in 38 games and slashed .174/.280/.279.