Diamondbacks' Blake Walston: Optioned to Triple-A

The Diamondbacks optioned Walston to Triple-A Reno on Thursday.

Since rejoining the D-backs' bullpen Sept. 15, Walston has surrendered eight runs (five earned) over just 5.2 innings while striking out seven batters and walking one. He and Yilber Diaz will end up as Arizona's roster casualties following the activation of Ryne Nelson (shoulder) and promotion of Alek Thomas, and the 23-year-old Walston likely won't make it back to the majors during the final series of the season this weekend.