
#63 RP · Red Sox
Height
6'4"
Weight
222 lbs
Age
28
College
New Mexico
Draft
2019, Rd 3, #86
Experience
2 yrs
Bats/Throws
R/R
Grade Justin Slaten
Your grade joins the crowd-sourced Fan Verdict.
On the field, Justin Slaten grades out as a strong RP for Red Sox (B Performance). That places him 150th of 389 graded relief pitchers. The public read is negative (D Sentiment), drawn from current news and social signal rather than the box score.
| Year | Team | GP | ERA | W-L | K | WHIP | IP | SV |
|---|---|---|---|---|---|---|---|---|
| Career | ![]() | 93 | 3.7425742 | 8-9 | 99 | 1.089109 | 0.0 | 5 |
| 2026 | ![]() | 14 | 7.30 | 0-3 | 16 | 1.62 | 12.1 | 0 |
| 2025 |
Length
1 year
AAV
$780K/yr
Justin Slaten grades a B performance mark, with his All-Star caliber stretches anchoring the read. The 28-year-old third-year reliever has logged 14 games in the 2026 season with 16 strikeouts, establishing himself as a solid-starter-tier contributor in Boston's bullpen despite the team's current 27-39 record and fourth-place standing in the AL East. His strikeout rate forms the backbone of his value proposition—a clean metric that suggests above-average stuff when he's healthy and locating. However, the damaging headline from his recent outing—two home runs surrendered in a blown save situation—underscores a genuine vulnerability in high-leverage spots that keeps him from grading higher and aligns with his media framing as a reclamation project rather than a proven late-inning force. His activation off the injured list following a successful Triple-A rehab stint marks a critical juncture: he's healthy enough to contribute, but he operates on thin organizational margin as one stabilizing thread in Boston's active bullpen reshuffling effort. Until he strings together sustained effectiveness rather than alternating between impressive strikeout stretches and costly meltdowns, his B-tier grade reflects ceiling-constrained upside—useful depth, not a cornerstone piece.
Justin Slaten ranks 150th of 389 graded relief pitchers by performance. That slots Justin between Franco Aleman (B) just ahead and Steven Matz (B) just behind.
Graded higher
Franco AlemanGuardiansBTommy KahnleRed SoxBJack AndersonRed SoxBGraded lower
Steven MatzRays| Date | OPP | Result | AB | H | R | HR | RBI | BB | SO |
|---|---|---|---|---|---|---|---|---|---|
| Wed, 6/10 | @ TB | L 5-7 | - | - | - | 0 | - | - | - |
| Sun, 6/7 | @ NYY | L 1-6 | - | - | - | 0 | - | - | - |
Red Sox sign RHP Justin Slaten
roster move · 5/6/2026
Red Sox sign RHP Justin Slaten
roster move · 5/3/2026
Red Sox sign RHP Justin Slaten on the
il move · 4/8/2026
Acquired RHP Justin Slaten from the New York Mets in exchange for minor league LHP Ryan Ammons and cash considerations.
trade · 12/6/2023
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Justin Slaten is a player in his 2nd MLB season listed at RP for the Red Sox. FanVerdicts covers every MLB player, team, GM, and transaction — and puts your verdict on all of it. Sign in to cast your Fan Verdict on Justin Slaten, see where the crowd lands, and argue the call. FanVerdicts also brings its own read — performance, sentiment, and Contract Value Index — as one honest input alongside the crowd's. Where FanVerdicts has weighed in so far: Performance B, Sentiment D.
The crowd's Fan Verdict moves in real time as fans vote on this profile. FanVerdicts' own read updates as new data lands — performance recalculates when MLB game stats post, sentiment shifts with media coverage and fan discussion, and the Contract Value Index recomputes when contract terms change. Contract details below show the structure (years, total value, average annual value, guarantees) behind the Contract Value Index read.
For league-wide context, the MLB hub has team rankings, GM report cards, the transactions feed, and live scoreboards. The MLB player rankings page sorts every active player by performance and contract value within their position.
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| 36 |
| 4.24 |
| 2-4 |
| 25 |
| 1.09 |
| 34.0 |
| 3 |
| 2024 | ![]() | 44 | 2.93 | 6-2 | 58 | 1.01 | 55.1 | 2 |
Peers ranked by Performance grade among players at the same position. Tap any name for their full profile.
| Fri, 6/5 | @ NYY | W 5-3 | - | - | - | 0 | - | - | - |