Hummel walked as a pinch hitter in Thursday's 4-2 win over San Diego.
The 27-year-old Hummel won a roster spot after the Diamondbacks placed Jordan Luplow (oblique) on the injured list. The switch-hitting outfielder will fill a depth role and could emerge as a platoon option for any of David Peralta, Pavin Smith or Daulton Varsho, being the only rostered outfielder who bats from the right side.