15-Day IL
Injury Oblique
Est. Return 4/24/2026
2026 Stats
W-L
0-1
ERA
0.00
WHIP
1.20
K
5
SV
0
Rest-of-Season Projections
2026 Fantasy Outlook
Slaten dazzled as a Rule 5 pick in his rookie season in 2024, but he took a step back last year. A shoulder injury sidelined the righty for three months, and when he returned late in the year he had an ERA near 6.00 across his final 12 outings. All told, Slaten's strikeout rate dipped from 25.9 percent to 18.2 percent and his walk rate went up from four percent to 7.3 percent year-over-year. The good news is Slaten's velocity was actually up slightly, and the difference in his xERA from his rookie season (3.25) to his sophomore campaign (3.51) was minor. Slaten should bounce back in 2026 as long as he's healthy, and if that happens, he'll be in the mix to pick up saves if something happens to Aroldis Chapman. Read Past Outlooks
Signed a one-year contract with the Red Sox in March of 2026.
Progresses to playing catch
Red Sox manager Alex Cora told reporters that Slaten (oblique) played catch Friday and Saturday, Gabrielle Starr of the Boston Herald reports.
Analysis
Slaten landed on the 15-day injured list April 8 due to a right oblique strain. He's progressed enough in his recovery to start playing catch and will likely need some turns on a rehab assignment before being cleared to return to major-league action. Slaten appeared in four regular-season games prior to his IL stint, recording two holds while allowing one unearned run on two hits and two walks with five strikeouts over 3.1 innings.
Slaten landed on the 15-day injured list April 8 due to a right oblique strain. He's progressed enough in his recovery to start playing catch and will likely need some turns on a rehab assignment before being cleared to return to major-league action. Slaten appeared in four regular-season games prior to his IL stint, recording two holds while allowing one unearned run on two hits and two walks with five strikeouts over 3.1 innings.
Pitching Stats
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2026 MLB Game Log
2026
2025
2024
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
14
Last 10 Games
14
Last 5 Games
14
How many pitches does Justin Slaten generally throw?
1-10
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90
91-100
101-110
111-120
121+
What part of the game does Justin Slaten generally pitch?
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
Extra
% Games Reaching Innings Threshold
% Games By Number of Innings Pitched
Left/Right Pitching Splits
Since 2024
-26%
BAA vs LHP
2026
-100%
BAA vs LHP
| BAA | K | BB | H | HR | ||||
|---|---|---|---|---|---|---|---|---|
| Since 2024vs Left | .182 | 45 | 15 | 28 | 3 | |||
| Since 2024vs Right | .246 | 43 | 6 | 48 | 4 | |||
| 2026vs Left | .000 | 4 | 0 | 0 | 0 | |||
| 2026vs Right | .286 | 1 | 2 | 2 | 0 | |||
| 2025vs Left | .189 | 10 | 7 | 10 | 1 | |||
| 2025vs Right | .233 | 15 | 3 | 17 | 2 | |||
| 2024vs Left | .188 | 31 | 8 | 18 | 2 | |||
| 2024vs Right | .252 | 27 | 1 | 29 | 2 | |||
| More Splits→ | View More Split Stats | |||||||
Home/Away Pitching Splits
Since 2024
-67%
ERA at Home
2026
No Stats
| ERA | WHIP | IP | K/9 | BB/9 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Since 2024Home | 1.62 | 0.79 | 44.1 | 7.5 | 1.4 | ||||
| Since 2024Away | 4.84 | 1.28 | 48.1 | 9.5 | 2.6 | ||||
| 2026Home | 0.00 | 0.50 | 2.0 | 9.0 | 0.0 | ||||
| 2026Away | 0.00 | 2.25 | 1.1 | 20.3 | 13.5 | ||||
| 2025Home | 1.59 | 0.71 | 17.0 | 5.8 | 1.6 | ||||
| 2025Away | 6.88 | 1.47 | 17.0 | 7.4 | 3.7 | ||||
| 2024Home | 1.78 | 0.87 | 25.1 | 8.5 | 1.4 | ||||
| 2024Away | 3.90 | 1.13 | 30.0 | 10.2 | 1.5 | ||||
| More Splits→ | View More Split Stats | ||||||||
Stat Review
How does Justin Slaten compare to other relievers?
This section compares his stats with all relief pitcher seasons from the previous three seasons (minimum 30 innings)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
K/BB
2.50K/9
13.5BB/9
5.4HR/9
0.0Fastball
96.4 mphERA
0.00WHIP
1.20BABIP
.313GB/FB
0.67Left On Base
75.0%Exit Velocity
77.9 mphBarrels/BBE
0.0%Spin Rate
2510 rpmBalls Hit 95+ MPH
17.6%Swinging Strike
12.5%Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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2025 Fantasy Outlook
Slaten, a 2019 draft pick by the Rangers, was selected by the Mets during the Rule 5 Draft last offseason. The 26-year-old was subsequently traded to Boston and impressed his new club during Grapefruit League play, flashing upper-90's velocity. Unsurprisingly, he made the Red Sox Opening Day roster and remained with the team all year. Slaten was an immediate fixture in Boston's high-leverage hierarchy, mixing four pitches effectively to a 2.93 ERA, 1.01 WHIP and 58:9 K:BB across 55.1 frames. The rookie right-hander recorded 10 or more strikeouts on all four of his offerings, including 18 apiece on his four-seamer and sweeper. Elbow inflammation cost Slaten a month-and-a-half last summer, but it's exciting to think about what he could offer in a full season. Red Sox manager Alex Cora said in the past that he envisions Slaten as a potential long-term closer option and he certainly has the talent to emerge out of a save share with Liam Hendriks and Aroldis Chapman in 2025.
More Fantasy News
Shelved with oblique strain
The Red Sox placed Slaten on the 15-day injured list Wednesday due to a right oblique strain.
Analysis
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Dealing with sore oblique
Slaten was unavailable for Tuesday's game against the Brewers due to oblique soreness, Chris Cotillo of MassLive.com reports.
Analysis
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Works clean eighth inning
Slaten struck out one over a perfect inning to earn a hold in Friday's 5-2 win over San Diego.
Analysis
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Struggles continue
Slaten allowed two runs on two hits and one walk over a third of an inning in Wednesday's 5-4 loss to the Athletics.
Analysis
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Shaky first outing off IL
Slaten allowed two hits and one walk while striking out one over a scoreless inning in Friday's 4-2 loss to the Pirates.
Analysis
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