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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.
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The Diamondbacks recalled Walston from Triple-A Reno on Sunday. The left-hander was activated from the injured list in mid-August after missing two months due to an elbow issue, but he was immediately sent to Triple-A. Walston has started in two of his three appearances with Arizona this season, but he's likely to work in a long-relief role this time around.
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The Diamondbacks reinstated Walston (elbow) from the 15-day injured list Monday and optioned him to Triple-A Reno. With Eduardo Rodriguez and Merrill Kelly both recently returning from the IL, the Diamondbacks don't have an open spot on the rotation for Walston. For now, Walston will head down to Triple-A, but the 23-year-old southpaw should eventually make his way back to the big club, possibly as a multi-inning option out of the bullpen if the rotation isn't impacted by injury. Prior to landing on the IL on June 6 due to left elbow inflammation, Walston registered a 2.84 ERA and 1.42 WHIP across 12.2 innings in three major-league appearances (two starts).
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Walston was placed on the 15-day injured list Thursday due to left elbow inflammation, Alex Weiner of ArizonaSports.com reports. Walston was called up to make his first MLB start May 27 and made an additional start Tuesday. He didn't factor in the decision in either start, but he gave up just two earned runs in nine innings. He seemed likely to stick in the rotation prior to the injury. The Diamondbacks selected Humberto Castellanos from Triple-A Reno in a corresponding move.
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Walston did not factor into the decision in Tuesday's win over the Giants, allowing two runs on two hits and four walks while striking out two over 4.1 innings. Walston didn't have his best stuff, evidenced by his four walks, but was able to keep the Giants at bay after the Diamondbacks got out to a 3-0 lead. Walston had a full count on six of the first nine hitters he faced and needed 50 pitches to get through two scoreless frames. The Giants eventually got a run across in the fourth and another in the fifth after Kevin Ginkel was unable to strand one of the two runners he inherited. Walston now owns a 2.84 ERA, 1.42 WHIP and 11:9 K:BB over 12.2 innings. The 23-year-old figures to get at least another look in the rotation while Zac Gallen (hamstring) makes his way back from injury. Walston lines up to face the Padres on the road this weekend.
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Last 7 Games
| DATE | Opp | W | L | S | INN | HA | ERA | BBI | K | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|
| 9/24 | vs  |
- | - | - | 2.1 | 4 | 5.06 | 0 | 1 | 1.71 |
| 9/23 | vs |
- | - | - | 1.0 | 0 | 3.86 | 0 | 1 | 0.00 |
| 9/17 | @  |
- | - | - | 2.0 | 3 | 4.15 | 1 | 4 | 2.00 |
| 9/15 | vs  |
1 | - | - | 0.1 | 0 | 3.27 | 0 | 1 | 0.00 |
| 6/04 | vs |
- | - | - | 4.1 | 2 | 3.27 | 4 | 2 | 1.38 |
| 5/26 | vs  |
- | - | - | 4.2 | 4 | 2.57 | 1 | 4 | 1.07 |
| 5/01 | vs  |
- | - | - | 3.2 | 3 | 6.00 | 4 | 5 | 1.91 |