Justin Slaten
Pitcher · Career Stats, Bio & Records (2024-2026)
Justin Slaten is a pitcher who has played in Major League Baseball since 2024 for the Boston Red Sox, a span of 3 seasons. Across 116 career appearances, he has gone 10-10 with a 3.73 ERA and 122 strikeouts. His career Pitcher PIV — Baseball Data Hub's era-adjusted measure of pitching impact — is 2456.8.
- W (Wins):
- Games credited to a pitcher whose team took a lead it never surrendered while he was the pitcher of record.
- ERA (Earned Run Average):
- Earned runs allowed per nine innings pitched: (ER × 9) ÷ IP. The primary measure of pitching effectiveness.
- SO (Strikeouts):
- For a batter, times retired on a third strike; for a pitcher, batters retired on a third strike.
- WHIP (Walks and Hits per Inning Pitched):
- Baserunners allowed per inning: (BB + H) ÷ IP. Under 1.00 is elite.
Data updated
- Position
- Pitcher
- Bats / Throws
- R / R
- Height / Weight
- 6'4" / 222 lb
- MLB Debut
- 2024-03-30
- Jersey
- #63
Full name: Justin Michael Slaten
Season-by-Season Pitching
Click a stat to plot it across every season.
| Year | Team | Lg | W | L | G | GS | CG | SHO | SV | IP | H | ER | BB | SO | ERA | Lg ERA | Pitcher PIV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024 | BOS | AL | 6 | 2 | 44 | 0 | 0 | 0 | 2 | 55.1 | 47 | 18 | 9 | 58 | 2.93 | 4.08 (+28%) | 2059.2 |
| 2025 | BOS | AL | 2 | 4 | 36 | 0 | 0 | 0 | 3 | 34.0 | 27 | 16 | 10 | 25 | 4.24 | 4.16 (-2%) | 397.6 |
| 2026 | BOS | AL | 2 | 4 | 36 | 0 | 0 | 0 | 0 | 31.1 | 35 | 16 | 8 | 39 | 4.60 | 4.18 (-10%) | - |
| Career · 3 seasons | 10 | 10 | 116 | 0 | 0 | 0 | 5 | 120.2 | 109 | 50 | 27 | 122 | 3.73 | — | 2,457 | ||
Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.
Season-by-Season Batting
Click a stat to plot it across every season.
| Year | Team | Lg | G | AB | R | H | 2B | 3B | HR | RBI | SB | BB | SO | AVG | Lg AVG | Lg OBP | Lg SLG | Lg OPS | PIV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024 | BOS | AL | 44 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2025 | BOS | AL | 36 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| Career · 2 seasons | 80 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | — | — | — | — | — | 0 | ||
Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.
Game Log & Splits
View full game log (160 games) →Per-game data from Retrosheet (regular season, through 2025).
Batting — Home / Away
| Split | G | AB | R | H | HR | RBI | AVG |
|---|---|---|---|---|---|---|---|
| Home | 35 | 0 | 0 | 0 | 0 | 0 | — |
| Away | 45 | 0 | 0 | 0 | 0 | 0 | — |
Pitching — Home / Away
| Split | G | IP | H | ER | BB | SO | ERA |
|---|---|---|---|---|---|---|---|
| Home | 35 | 42.1 | 27 | 8 | 7 | 35 | 1.70 |
| Away | 45 | 47.0 | 47 | 26 | 12 | 48 | 4.98 |
Last 10 Games — Pitching
| Date | Tm | Opp | Dec | IP | H | R | ER | BB | SO | HR |
|---|---|---|---|---|---|---|---|---|---|---|
| 2025-09-26 | BOS | DET | — | 0.2 | 0 | 0 | 0 | 1 | 0 | 0 |
| 2025-09-23 | BOS | TOR | — | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2025-09-20 | BOS | TBR | — | 0.1 | 1 | 0 | 0 | 0 | 0 | 0 |
| 2025-09-19 | BOS | TBR | — | 1.0 | 0 | 0 | 0 | 0 | 2 | 0 |
| 2025-09-17 | BOS | OAK | — | 1.1 | 0 | 0 | 0 | 0 | 1 | 0 |
| 2025-09-16 | BOS | OAK | — | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2025-09-10 | BOS | OAK | — | 0.1 | 2 | 2 | 2 | 1 | 0 | 0 |
| 2025-09-09 | BOS | OAK | — | 1.0 | 2 | 0 | 0 | 0 | 1 | 0 |
| 2025-09-05 | BOS | AZ | — | 1.0 | 4 | 4 | 4 | 0 | 1 | 1 |
| 2025-09-02 | BOS | CLE | W | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 |
Career Games by Position
Circle size = games played at each position.
| Position | Games |
|---|---|
| Pitcher | 80 |
Justin Slaten: the record in brief
The debut date in the bio is March 30, 2024; Justin Slaten is an active player, and this profile updates as the season goes on. Slaten's only club in the season tables is the Boston Red Sox. Listed as a pitcher, Slaten both batted and threw right-handed. Height and weight on file: 6 feet, 4 inches and 222 pounds. Slaten was born on September 15, 1997, in Longview, TX, USA. The given name on file is Justin Michael Slaten.
The pitching table credits Slaten with a 10-10 record and a 3.73 ERA in 116 games. Slaten has 122 strikeouts. Against a 4.14 league ERA for the same years, Slaten was 9.9% better. The best win total was 6, in 2024. 2024 was Slaten's sharpest full season, a 2.93 ERA against the league's 4.08. Slaten's career Pitcher PIV, which scores run prevention against each season's league, is 2,456.8.
The game-log section draws on 160 games of Retrosheet box scores for Slaten.
Slaten appears at one position only: pitcher, in 80 games. On the mound, Slaten's fielding totals are 5 putouts, 3 assists and 0 errors.
Pitching in the playoffs, Slaten went 0-0 with a 4.50 ERA in 2 games. Those appearances came in 2025.
Frequently Asked Questions about Justin Slaten
- What years did Justin Slaten play?
- Justin Slaten played in Major League Baseball from 2024 to 2026.
- Was Justin Slaten a pitcher?
- Yes. Justin Slaten pitched in the major leagues, recording 10 wins and 122 strikeouts.
- What teams has Justin Slaten played for?
- Justin Slaten has played for one team, the Boston Red Sox (2024–2026).
- What are Justin Slaten's career stats?
- In 116 games, Justin Slaten has gone 10-10 with a 3.73 ERA, 122 strikeouts, 120.2 innings pitched, and 5 saves.
- What position does Justin Slaten play?
- Justin Slaten plays primarily as a pitcher, the position where he has appeared in the most games.
- How tall is Justin Slaten and how much does he weigh?
- Justin Slaten is listed at 6 feet 4 inches and 222 pounds.
- What number does Justin Slaten wear?
- Justin Slaten wears number 63, according to MLB's 2026 roster data.
- What was Justin Slaten's career ERA?
- Justin Slaten finished with a 3.73 career ERA, going 10-10 with 122 strikeouts.
- How many strikeouts did Justin Slaten have?
- Justin Slaten recorded 122 career strikeouts.