Qualls was placed on the 10-day disabled list Sunday with lower back spasms, Patrick Saunders of The Denver Post reports.

This is the first report of Qualls being plagued by back discomfort. This injury may be attributable to his past two shaky relief outings in which he allowed two earned runs over his previous 1.2 innings of work. Carlos Estevez has been recalled from Triple-A Albuquerque in a corresponding move.

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