The Diamondbacks recalled Alexander from Triple-A Reno on Wednesday.
Alexander will provide some infield depth while Ketel Marte (ankle) is banged up. The rookie slashed .297/.374/.446 versus left-handed pitching during his previous stint in the majors this season, so he's likely to see the majority of his playing time against southpaws. Alexander will crack the lineup Wednesday against a right-hander in Rockies rookie Tanner Gordon, filling in for Marte at second base and batting eighth.