The Diamondbacks reinstated Walker (oblique) from the 10-day injured list Tuesday, Jesse Friedman of GoPHNX.com reports.
A left oblique strain sent Walker to the injured list at the end of July, and he's now set to reclaim his role as Arizona's everyday first baseman. The 33-year-old slashed .152/.293/.273 with a homer and five RBI across his last 10 games prior to getting hurt, and he may need some time to kick the rust off after not playing in any rehab games. Lourdes Gurriel (calf) was placed on the IL in a corresponding move.