Description
- Position
- P
- Team
- KC
- Type
- Pitcher
- Bats
- Right
- Throws
- Right
- Born
- 1997-04-18
- Age
- 29
- Country
- USA
- Height
- 6'3"
- Weight
- 210 lb
- Last active
- 2026
Career Résumé
3 seasons
| Seasons | 3 2024–2026 |
| Games | 71 |
| W-L | 12-10 |
| ERA | 4.13 |
| WHIP | 1.25 |
| IP | 213 |
| SO | 150 |
| SV | 0 |
Pitching Projections
2026 · per ~700 BF
| Stat | Proj | Range (p10–p90) | vs LY |
|---|---|---|---|
| ERA | 4.36 | 3.38–5.96 | +0.22 |
| WHIP | 1.30 | 1.13–1.59 | +0.03 |
| SO | 129 | 101–154 | −2 |
| BB | 50 | 34–65 | +1 |
| HR | 20 | 12–30 | +1 |
| Hits | 162 | 149–188 | +3 |
| ER | 79 | 61–108 | +3 |
Regular season · OAA 2016+
| Season | Pos | G | GS | Inn | PO | A | E | DP | FLD% | RF/9 | OAA |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | P | 10 | 10 | 54.0 | 8 | 5 | 1 | 2 | .929 | 2.17 | — |
| 2025 | P | 19 | 19 | 112.2 | 7 | 5 | 2 | 0 | .857 | 0.96 | — |
| 2024 | P | 42 | 0 | 46.2 | 1 | 8 | 0 | 0 | 1.000 | 1.74 | — |
2026 · last 10
| Date | Opp | Res | Dec | IP | H | R | ER | HR | BB | SO | Pit | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-07-02 | vs | TB | L | L | 2.0 | 4 | 3 | 3 | 0 | 1 | 0 | 51 |
| 2026-06-21 | vs | STL | L | L | 1.2 | 9 | 9 | 9 | 3 | 1 | 0 | 49 |
| 2026-06-14 | vs | HOU | W | W | 7.1 | 5 | 0 | 0 | 0 | 1 | 4 | 97 |
| 2026-06-09 | vs | TEX | W | ND | 5.0 | 8 | 2 | 1 | 0 | 1 | 3 | 86 |
| 2026-06-03 | @ | CIN | W | ND | 7.0 | 6 | 2 | 2 | 1 | 2 | 8 | 96 |
| 2026-05-29 | @ | TEX | L | L | 5.0 | 6 | 6 | 4 | 1 | 1 | 5 | 91 |
| 2026-05-23 | vs | SEA | W | W | 9.0 | 4 | 0 | 0 | 0 | 1 | 2 | 108 |
| 2026-05-17 | @ | STL | W | W | 6.1 | 4 | 0 | 0 | 0 | 1 | 3 | 82 |
| 2026-05-12 | @ | CWS | L | ND | 4.2 | 5 | 5 | 5 | 2 | 3 | 6 | 94 |
| 2026-05-05 | vs | CLE | W | W | 6.0 | 4 | 3 | 3 | 1 | 0 | 3 | 83 |
2026 · vs 260
K/9
5.75
BB/9
2.090
HR/9
1.327
ERA
4.5031
WHIP
1.2454
xERA
3.8261
Brl%A
6.8%62
PlayerMedian (50th)percentile vs league
Career Highs
| Stat | Best | Year |
|---|---|---|
| Wins | 5 | 2025 |
| SO | 77 | 2025 |
| SV | 0 | 2026 |
| ERA | 3.51 | 2025 |
| WHIP | 1.14 | 2025 |
Comparable Players
2026 · stat-profile similarity
Pitching Form
2026 · SP · rolling 15-game ERA
Consistency
Pitching · DK pts/game
| Per game | 11.1 |
| Ceiling (90th) | 24.9 |
| Floor (10th) | -6.1 |
| Std dev | 13.8 |
| Boom rate | 40% |
| Bust rate | 20% |
| Profile | Volatile |
Boom ≥1.5× avg · Bust ≤0.5× avg · 10 games
Season
Pitch Arsenal
2025 · Statcast
| Pitch | Use | Velo | Spin |
|---|---|---|---|
| 4-Seam | 25% | 94.0 | 2176 |
| Sinker | 25% | 93.6 | 2146 |
| Slider | 16% | 85.4 | 2517 |
| Cutter | 15% | 90.5 | 2347 |
| Changeup | 11% | 87.5 | 1465 |
| Sweeper | 7% | 82.6 | 2548 |
Plate Discipline
2025 · induced
26.2%
Chase
lg 28.5%
66.4%
Z-Swing
lg 67%
16.1%
Whiff
lg 24.5%
83.9%
Contact
lg 76%
49.5%
Zone
lg 48.5%
24.6%
CSW
lg 28%
1,844 pitches · green/red vs league avg
Statcast Trend
xERA by season · taller = better
Barrel% Against by season · taller = better
News
5 items
- Royals Place Stephen Kolek On 15-Day Injured ListPrior to today’s 19-2 loss to the Padres, the Royals activated right-hander Stephen Kolek from the restricted list and placed Kolek on the 15-day injured list due to a right flexor strain. K.C. manager Matt Quatraro told MLB.com’s Anne Rogers and other media that Kolek will undergo testing on Monday to determine the extent of […]
- Stephen Kolek: Out with flexor strainKolek (personal) was reinstated from the family medical leave list and placed on the 15-day injured list Sunday due to a right flexor strain. Visit RotoWire.com for more analysis on this update.
- Stephen Kolek: Expected to start ThursdayKolek (personal) is expected to make his next scheduled start Thursday against Tampa Bay, Anne Rogers of MLB.com reports. Visit RotoWire.com for more analysis on this update.
- Stephen Kolek: Shifts to family emergency listThe Royals transferred Kolek (personal) from the paternity list to the family medical emergency list Tuesday. Visit RotoWire.com for more analysis on this update.
- Stephen Kolek: Going on paternity listKolek will be placed on the paternity leave list and will not make his next scheduled start Friday against the White Sox, Joel Goldberg of Bally Sports Kansas City reports. Visit RotoWire.com for more analysis on this update.