Isaiah Campbell#49

Reno Aces·BBRef

RSFree agentFLBFree agent

Pos: Pitcher

B/T: R / R

Born: Aug 15, 1997 (29)

Height: 6' 4"

Weight: 230 lbs

Owned: 0.0%

From: Angra de Heroismo, Portugal

Drafted: 2019

Isaiah Campbell

#49

Reno Aces BBRef

RSFree agentFLBFree agent

Position: Pitcher

Bats/Throws: R / R

Born: Aug 15, 1997 (29)

Height: 6' 4"

Weight: 230 lbs

Owned: 0.00%

From: Angra de Heroismo, Portugal

Drafted:

The Diamondbacks reassigned Campbell to minor-league camp Thursday, Alex D'Agostino of SI.com reports.

Mar 15Rotowire

Plenty of spots in Arizona's Opening Day bullpen were up for grabs in spring training, but Campbell was unable to seize one despite allowing just two baserunners over five innings across six Cactus League appearances. Campbell saw big-league action in each of the past three seasons but is slated to begin the 2026 campaign at Triple-A Reno.

The Diamondbacks signed Campbell to a minor-league contract Dec. 5.

Dec 15Rotowire

In parts of three seasons in the majors, Campbell has collected a 5.65 ERA and 42:16 K:BB over 43 innings. The 28-year-old reliever will give the Diamondbacks some experienced bullpen depth at Triple-A Reno in 2026.

The Red Sox outrighted Campbell to Triple-A Worcester on Thursday.

Oct 17Rotowire

Campbell has been torched for 19 runs (18 earned) over 14.1 innings over the last two seasons during his brief time with the Red Sox. He's no longer on the 40-man roster but will remain in the organization for the time being.

The Red Sox optioned Campbell to Triple-A Worcester on Wednesday.

8/20/25Rotowire

Campbell made five appearances after being recalled earlier this month, yielding four runs with a 3:1 K:BB over 5.2 innings of work. The Red Sox are expected to call up right-hander Richard Fitts in a corresponding move prior to Thursday's game against the Yankees.

The Red Sox recalled Campbell from Triple-A Worcester on Tuesday.

8/5/25Rotowire

Campbell has allowed two runs over two innings during his brief time in the majors this season, and he has collected a 4.17 ERA and 41:15 K:BB across 45.1 frames with Worcester. The righty will likely be used as a low-leverage reliever.

2026

Poor

Below Avg

Average

Above Avg

Elite

xERA

xBA

Fastball Velo

Avg Exit Velo

Chase %

Whiff %

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BB %

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Hard-Hit %

Year by Year

Year	G	W	L	SV	IP	H	HR	BB	K	ERA	WHIP
2023SEA	27	4	1	1	28.2	22	2	13	33	2.83	1.22
2024BOS	8	0	1	0	6.2	14	3	2	6	16.20	2.40
2025BOS	6	0	0	0	7.2	13	1	1	3	7.04	1.83
Career	41	4	2	1	43.0	49	6	16	42	5.65	1.51