The Diamondbacks optioned Walston to Triple-A Reno on Wednesday.
Walston picked up the win in Tuesday's extra-innings victory over the Royals but finds himself back in the minors a day later. The win was the lefty's first in the majors since 2024, as he missed the 2025 campaign following Tommy John surgery.
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Diamondbacks' Blake Walston: Earns win in extra innings
Rotowire
Walston (1-0) earned the win Tuesday against the Royals after allowing one unearned run while walking three and striking out two over two innings in relief.
Walston entered for the 10th with Arizona ahead 3-2 and surrendered the tying run, though it was unearned due to the automatic runner. The left-hander returned for the 11th after the Diamondbacks regained the lead and closed out the 5-3 victory with a scoreless frame. This was Walston's second appearance following Tommy John surgery, as he was activated Sept. 1.
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Diamondbacks' Blake Walston: Activated from IL
Rotowire
The Diamondbacks reinstated Walston (elbow) from the 60-day injured list Tuesday.
Walston has been on the injured list all season while recovering from a Tommy John procedure he underwent last spring. He was cleared to begin a rehab assignment Aug. 4 and has since given up four earned runs in 7.2 innings at Triple-A Reno. The 25-year-old lefty will join the D-backs' bullpen as a long reliever now that he's fully healthy, though he could still be developed as a starter in the future. Ryan Thompson (back) was placed on the 60-day IL in a corresponding move.
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Diamondbacks' Blake Walston: Gearing up for relief role
Rotowire
Walston (elbow) struck out two and allowed one hit in a scoreless inning during a rehab appearance Wednesday with Triple-A Reno.
Walston had been a full-time starter throughout his minor-league career and started in two of his seven appearances during his debut season with the Diamondbacks in 2024 before undergoing Tommy John surgery last spring. While the Diamondbacks may not have closed the door on developing the 25-year-old as a starter, it appears he'll be preparing for a multi-inning relief role for the remainder of the season once he returns from the 60-day injured list. He's been used out of the bullpen for each of his first three rehab appearances with Reno, covering four innings while striking out three and allowing one unearned run on two hits and no walks.
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Diamondbacks' Blake Walston: Ready for rehab assignment
Rotowire
Walston (elbow) will begin a rehab assignment Tuesday, Jack Sommers of SI.com reports.
Walston is finally rehab to pitch in official games following a long rehab from Tommy John surgery. The left-hander has a chance to contribute for the Diamondbacks in September, though he's not a given to rejoin the major-league roster once his rehab assignment concludes.
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Diamondbacks' Blake Walston: Back on 60-day IL to open season
Rotowire
Arizona placed Walston (elbow) on the 60-day injured list Wednesday.
Walston will open a second consecutive season on the 60-day injured list after he was shelved throughout the 2025 campaign after undergoing Tommy John surgery March 26 of last year. Per Alex Weiner of ArizonaSports.com, Walston was spotted throwing off flat ground Feb. 10, but it's unclear if the southpaw has progressed to mound work since then. In any case, Walston will be out for at least the first two months of the 2026 campaign while he continues to build back up following surgery.
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Diamondbacks' Blake Walston: Moves to 60-day IL
Rotowire
The Diamondbacks placed Walston (elbow) on the 60-day injured list Sunday.
It was announced in mid-March that Walston will require Tommy John surgery, so it was only a matter of time before he was shifted to the 60-day IL. The left-hander will miss the entirety of this season and isn't likely to be back until midseason of the 2026 campaign.
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Diamondbacks' Blake Walston: Promoted Sunday
Rotowire
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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Diamondbacks' Blake Walston: Comes off IL, optioned to Reno
Rotowire
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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Diamondbacks' Blake Walston: Heads to 15-day IL
Rotowire
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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Diamondbacks' Blake Walston: Rewarded with another start
Rotowire
Walston is slated to start Saturday's game against the Mets at Citi Field.
Walston will stick around as the fifth member of Arizona's rotation after he blanked the Marlins over 4.2 innings while striking out four in his first MLB start Sunday. Though the 23-year-old southpaw came through with a passable showing in his first start, fantasy managers should tread carefully with Walston, who has struggled to keep his walks in check at nearly every rung of the minors. Though he issued just one free pass against Miami, Walston walked four batters in his MLB debut May 1, when he tossed 3.2 innings of long relief against the Dodgers.
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Diamondbacks' Blake Walston: Impresses in starting role
Rotowire
Walston did not factor into the decision in Sunday's loss to the Marlins. He tossed 4.2 scoreless innings while allowing just four hits and a walk and striking out four.
Walston kept the Marlins' bats at bay and looked sharp in his first MLB start. He struck out a pair in the opening frame and was able to shut down the minimal scoring opportunities against him. Walston also pounded the zone, throwing 46 of his 65 pitches for strikes while garnering eight whiffs on the afternoon. Manager Torey Lovullo has not yet indicated whether Walston will get another start or not. If he does, the 23-year-old lefty would line up to face the Mets in New York this weekend. He now has nine strikeouts over his first 8.1 big league innings.
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Diamondbacks' Blake Walston: Confirmed for start Sunday
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Diamondbacks manager Torey Lovullo confirmed that Walston will be called up from Triple-A Reno to start Sunday's game against the Marlins, Alex Weiner of ArizonaSports.com reports.
He'll step into the rotation spot vacated by Slade Cecconi, who was optioned to Reno earlier in the week. Walston will be making his first MLB start and second MLB appearance Sunday after he was charged with two earned runs on three hits and four walks while striking out five over 3.2 innings in a long-relief appearance May 1 against the Dodgers. The 22-year-old lefty has been a member of the rotation for Reno for much of the season, logging a 4.54 ERA, 1.68 WHIP and 35:20 K:BB across 35.2 innings in the hitter-friendly Pacific Coast League.
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Diamondbacks' Blake Walston: Back down to Triple-A
Rotowire
Walston was optioned to Triple-A Reno on Thursday.
It was a brief stint for Walston, who was recalled by the Diamondbacks on Wednesday. He threw for 3.2 innings in Wednesday's loss to the Dodgers, allowing two runs on three hits and four walks while striking out five. The move corresponds with Arizona acquiring right-hander Matt Bowman from the Twins on Thursday, while Merrill Kelly (shoulder) was transferred to the 60-day IL.
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Diamondbacks' Blake Walston: Recalled to majors
Rotowire
Walston was recalled from Triple-A Reno on Wednesday.
Walston didn't make the cut for Arizona's Opening Day roster, but he will get a chance to play with the team after five years in the minors. The lefty pitcher has logged a 4.79 ERA and 1.88 WHIP over 20.2 innings in five games played with the Reno Aces so far this year. The 22-year-old will be making his major-league debut when he gets into a game and could work in long relief since he's pitched out of Reno's rotation.
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Diamondbacks' Blake Walston: Protected from Rule 5 Draft
Rotowire
The Diamondbacks added Walston to their 40-man roster Tuesday.
Walston spent all of 2023 with Triple-A Reno, posting a 4.52 ERA and 1.57 WHIP in 149.1 innings. Teams won't be able to pluck Walston away from Arizona in the upcoming Rule 5 Draft, but given his command issues and low strikeout totals, the 22-year-old southpaw has work to do before he can be considered for the major-league roster.
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Diamondbacks' Blake Walston: Getting crushed in Double-A
Rotowire
Walston has a 7.12 ERA, 1.93 WHIP and 35:17 K:BB through 36.2 innings (eight starts) for Double-A Amarillo.
After Walston dominated in High-A to open the year, there was reason to expect more than this following his promotion in early May. The southpaw has given up 53 hits, including seven home runs, across those 36.2 frames since his promotion. That said, he's still a few days shy of his 21st birthday, and Walston struggled some after being promoted to High-A last year before coming back stronger in 2022, so he may just need some adjustment time.
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Diamondbacks' Blake Walston: Makes jump to Double-A
Rotowire
The Diamondbacks promoted Walston from High-A Hillsboro to Double-A Amarillo on Monday, Zach Buchanan of The Athletic reports.
Walston was rewarded with a quick promotion to Double-A after he turned in a 2.55 ERA, 1.13 WHIP and 27:7 K:BB across 17.2 innings with Hillsboro. With a strong finish to the 2022 minor-league campaign, Walston could be given a chance to compete for a rotation spot with the Diamondbacks next spring.
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Diamondbacks' Blake Walston: Gets taxi squad nod
Rotowire
Walston will be on Arizona's taxi squad, Nick Piecoro of The Arizona Republic reports.
Walston is one of the best pitching prospects in the Diamondbacks' system, but he doesn't turn 19 until later this month and has not yet pitched above short-season ball. He had a 2.45 ERA, 0.91 WHIP and 17:2 K:BB in 11 innings last year after Arizona selected him with the No. 26 overall pick in the draft.
