Justin Slaten
BOS • P • Throws R • 2026 Season
Yahoo eligible: RP
Value
Standard score (σ), not a percentile, vs all qualified pitchers — 0 = average, +1 = one standard deviation above the mean. Built from 5x5 category z-scores (like Baseball Monster).
Control & Efficiency
Strike-throwing and length profile — drives the Likely-QS / High-K/BB start flags. The bar under each stat is this pitcher's percentile vs 207 qualified MLB starters (100th = best — already direction-adjusted, so a low BB% or P/PA scores high).
Arsenal
Throwing hand and pitch mix (share of pitches thrown) — the traits the matchup ratings below weigh against each opponent's splits.
Season Stats
The big number is the actual stat. The bar below it is this pitcher's percentile vs 385 qualified MLB pitchers (≥30 IP) this season — 100th = best, direction-adjusted (a low ERA/WHIP/BB scores high).
Splits & Tendencies
How this pitcher fares by batter hand, venue, opponent lineup quality (elite→poor offenses), and over the last 30 days. Lower ERA/WHIP is better; OPS-against shows for the hand/venue splits. Hover a tag for the numbers.
| Split | IP | ERA | WHIP | K/9 |
|---|
Luck Factor
How much this pitcher's results are outrunning or trailing the quality of what actually happened — league-relative. Hover a meter for the inputs.
Game Log (33 games)
| Date | Opp | Dec | IP | H | R | ER | BB | SO | HR | P |
|---|---|---|---|---|---|---|---|---|---|---|
| Aug 2 | @ Los Angeles Dodgers | - | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 5 |
| Aug 1 | @ Los Angeles Dodgers | W | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 8 |
| Jul 29 | @ Athletics | - | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 19 |
| Jul 27 | @ Athletics | - | 0.2 | 0 | 0 | 0 | 0 | 0 | 0 | 5 |
| Jul 26 | vs Toronto Blue Jays | - | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 12 |
| Jul 22 | vs Baltimore Orioles | - | 1.1 | 1 | 0 | 0 | 0 | 1 | 0 | 19 |
| Jul 17 | vs Tampa Bay Rays | - | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 12 |
| Jul 11 | @ New York Mets | - | 0.2 | 1 | 0 | 0 | 1 | 2 | 0 | 17 |
| Jul 9 | @ Chicago White Sox | - | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 8 |
| Jul 7 | @ Chicago White Sox | - | 0.2 | 0 | 0 | 0 | 0 | 2 | 0 | 10 |
| Jul 5 | @ Los Angeles Angels | - | 1 | 2 | 1 | 1 | 0 | 1 | 0 | 18 |
| Jun 30 | vs Washington Nationals | - | 0.2 | 2 | 1 | 1 | 0 | 2 | 0 | 13 |
| Jun 28 | vs New York Yankees | W | 1 | 1 | 2 | 0 | 0 | 1 | 0 | 16 |
| Jun 27 | vs New York Yankees | - | 0.2 | 0 | 0 | 0 | 0 | 2 | 0 | 12 |
| Jun 24 | @ Colorado Rockies | L | 1 | 4 | 2 | 2 | 0 | 1 | 0 | 19 |
| Jun 23 | @ Colorado Rockies | - | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 7 |
| Jun 19 | @ Seattle Mariners | - | 0.1 | 0 | 0 | 0 | 0 | 1 | 0 | 6 |
| Jun 18 | vs Toronto Blue Jays | - | 1 | 2 | 0 | 0 | 0 | 1 | 0 | 15 |
| Jun 13 | vs Texas Rangers | - | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 16 |
| Jun 10 | @ Tampa Bay Rays | - | 0.2 | 3 | 2 | 2 | 0 | 0 | 1 | 19 |
| Jun 7 | @ New York Yankees | L | 0.2 | 3 | 4 | 4 | 1 | 2 | 1 | 25 |
| Jun 5 | @ New York Yankees | - | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 4 |
| May 30 | @ Cleveland Guardians | - | 1.1 | 1 | 0 | 0 | 1 | 2 | 0 | 21 |
| May 22 | vs Minnesota Twins | L | 0.2 | 4 | 4 | 4 | 1 | 1 | 2 | 28 |
| May 19 | @ Kansas City Royals | - | 1 | 0 | 0 | 0 | 0 | 2 | 0 | 12 |
| May 18 | @ Kansas City Royals | - | 1 | 0 | 0 | 0 | 0 | 2 | 0 | 17 |
| May 14 | vs Philadelphia Phillies | - | 0.2 | 1 | 0 | 0 | 0 | 1 | 0 | 8 |
| May 13 | vs Philadelphia Phillies | - | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 14 |
| May 10 | vs Tampa Bay Rays | - | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 15 |
| Apr 4 | vs San Diego Padres | - | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 19 |
| Apr 3 | vs San Diego Padres | - | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 9 |
| Mar 28 | @ Cincinnati Reds | L | 0.1 | 1 | 1 | 0 | 1 | 1 | 0 | 11 |
| Mar 26 | @ Cincinnati Reds | - | 1 | 0 | 0 | 0 | 1 | 2 | 0 | 17 |