Blake Walston#48

Reno Aces·BBRef

RSFree agentFLBFree agent

Pos: Pitcher

B/T: L / L

Born: Jun 28, 2001 (25)

Height: 6' 5"

Weight: 205 lbs

Owned: 0.0%

From: Wilmington, NC

Drafted: 2019

Blake Walston

#48

Reno Aces BBRef

RSFree agentFLBFree agent

Position: Pitcher

Bats/Throws: L / L

Born: Jun 28, 2001 (25)

Height: 6' 5"

Weight: 205 lbs

Owned: 0.01%

From: Wilmington, NC

Drafted:

G	GS	IP	W-L	ERA	WHIP	K	BB	SV	K/9	K/BB	FIP
2	0	3.0	1-0	3.00	1.33	2	3	0	6.0	0.67	4.77

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

1w agoRotowire

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.

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.

1w agoRotowire

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.

The Diamondbacks reinstated Walston (elbow) from the 60-day injured list Tuesday.

2w agoRotowire

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.

Walston (elbow) struck out two and allowed one hit in a scoreless inning during a rehab appearance Wednesday with Triple-A Reno.

Aug 13Rotowire

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.

Walston (elbow) will begin a rehab assignment Tuesday, Jack Sommers of SI.com reports.

Aug 4Rotowire

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.

Poor

Below Avg

Average

Above Avg

Elite

xERA

4.42

xBA

.222

Fastball Velo

91.6 mph

Avg Exit Velo

85.7 mph

Chase %

13.0%

Whiff %

33.3%

K %

15.4%

BB %

23.1%

Barrel %

12.5%

Hard-Hit %

12.5%

Blake Walston#48

Blake Walston

2026 Season

Player News

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

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.

The Diamondbacks reinstated Walston (elbow) from the 60-day injured list Tuesday.

Walston (elbow) struck out two and allowed one hit in a scoreless inning during a rehab appearance Wednesday with Triple-A Reno.

Walston (elbow) will begin a rehab assignment Tuesday, Jack Sommers of SI.com reports.

Percentile Rankings

Year by Year

Batting Splits

Splits

vs Batters: Left-Handed

vs Batters: Right-Handed

Rolling Performance

Season Average

Last 7 Days

Last 14 Days

Last 30 Days

Year	G	GS	W	IP	H	HR	BB	K	ERA	WHIP
2024ARI	7	2	1	18.1	16	4	10	18	4.42	1.42
2026ARI	2	0	1	3.0	1	0	3	2	3.00	1.33
Career	9	2	2	21.1	17	4	13	20	4.22	1.41