Stephen Kolek
Pitcher · Career Stats, Bio & Records (2024-2026)
Stephen Kolek is a pitcher who has played in Major League Baseball since 2024 for the San Diego Padres and the Kansas City Royals, a span of 3 seasons. Across 71 career appearances, he has gone 12-10 with a 4.13 ERA and 150 strikeouts. His career Pitcher PIV — Baseball Data Hub's era-adjusted measure of pitching impact — is 1559.8.
- 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
- 6'3" / 210 lb
- MLB Debut
- 2024-03-21
Full name: Stephen James Kolek
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 | SDN | NL | 3 | 0 | 42 | 0 | 0 | 0 | 0 | 46.2 | 59 | 27 | 12 | 39 | 5.21 | 4.08 (-28%) | 594.2 |
| 2025 | SDN | NL | 4 | 5 | 14 | 14 | 1 | 1 | 0 | 79.2 | 78 | 37 | 26 | 56 | 4.18 | 4.16 (-1%) | -236.8 |
| 2025 | KCA | AL | 1 | 2 | 5 | 5 | 0 | 0 | 0 | 33.0 | 20 | 7 | 5 | 21 | 1.91 | 4.16 (+54%) | 1202.4 |
| 2026 | KC | AL | 4 | 3 | 10 | 10 | 1 | 1 | 0 | 54.0 | 55 | 27 | 12 | 34 | 4.50 | 4.18 (-8%) | - |
| Career · 4 seasons | 12 | 10 | 71 | 29 | 2 | 2 | 0 | 213.1 | 212 | 98 | 55 | 150 | 4.13 | — | 1,560 | ||
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 | SDN | NL | 42 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2025 | SDN | NL | 14 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2025 | KCA | AL | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| Career · 3 seasons | 61 | 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 (122 games) →Per-game data from Retrosheet (regular season, through 2025).
Batting — Home / Away
| Split | G | AB | R | H | HR | RBI | AVG |
|---|---|---|---|---|---|---|---|
| Home | 29 | 0 | 0 | 0 | 0 | 0 | — |
| Away | 32 | 0 | 0 | 0 | 0 | 0 | — |
Pitching — Home / Away
| Split | G | IP | H | ER | BB | SO | ERA |
|---|---|---|---|---|---|---|---|
| Home | 29 | 67.1 | 71 | 37 | 13 | 55 | 4.95 |
| Away | 32 | 92.0 | 86 | 34 | 30 | 61 | 3.33 |
Last 10 Games — Pitching
| Date | Tm | Opp | Dec | IP | H | R | ER | BB | SO | HR |
|---|---|---|---|---|---|---|---|---|---|---|
| 2025-09-24 | KCR | LAA | L | 6.0 | 5 | 3 | 2 | 2 | 2 | 1 |
| 2025-09-18 | KCR | SEA | L | 7.1 | 2 | 2 | 1 | 1 | 8 | 0 |
| 2025-09-11 | KCR | CLE | — | 6.2 | 3 | 1 | 1 | 1 | 4 | 0 |
| 2025-09-06 | KCR | MIN | W | 7.0 | 6 | 2 | 2 | 1 | 4 | 0 |
| 2025-08-30 | KCR | DET | — | 6.0 | 4 | 1 | 1 | 0 | 3 | 0 |
| 2025-07-27 | SDP | STL | W | 6.0 | 4 | 2 | 2 | 3 | 2 | 1 |
| 2025-07-22 | SDP | MIA | L | 5.2 | 8 | 3 | 3 | 1 | 5 | 0 |
| 2025-07-05 | SDP | TEX | L | 5.1 | 9 | 6 | 6 | 1 | 2 | 2 |
| 2025-06-29 | SDP | CIN | — | 5.2 | 3 | 1 | 1 | 1 | 5 | 0 |
| 2025-06-23 | SDP | WAS | L | 4.1 | 5 | 5 | 4 | 1 | 5 | 0 |
Fielding Statistics
Career Games by Position
Circle size = games played at each position.
| Position | Games |
|---|---|
| Pitcher | 61 |
Stephen Kolek: the record in brief
The debut date in the bio is March 21, 2024; Stephen Kolek is an active player, and this profile updates as the season goes on. Club by club, the record runs the San Diego Padres (2024 to 2025) and the Kansas City Royals (2025). Kolek is listed as a pitcher at 6 feet, 3 inches and 210 pounds. The bio says Kolek batted and threw right-handed. Kolek was born on April 18, 1997, in Houston, TX, USA. The given name on file is Stephen James Kolek.
Across 71 games (29 starts), Kolek has recorded 12 wins against 10 losses with a 4.13 ERA. Kolek has 150 strikeouts. Kolek's 4.13 ERA was close to the 4.14 league figure for those seasons. 2025 was Kolek's sharpest full season, a 4.18 ERA against the league's 4.16. Pitcher PIV, the site's era-adjusted run-prevention measure, totals 1,559.8 for Kolek's career.
The game-log section draws on 122 games of Retrosheet box scores for Kolek.
Every defensive appearance on record for Kolek, 61 games, came at pitcher. The fielding table credits Kolek with 8 putouts, 13 assists and 2 errors on the mound.
Frequently Asked Questions about Stephen Kolek
- What years did Stephen Kolek play?
- Stephen Kolek played in Major League Baseball from 2024 to 2026.
- Was Stephen Kolek a pitcher?
- Yes. Stephen Kolek pitched in the major leagues, recording 12 wins and 150 strikeouts.
- What was Stephen Kolek's career ERA?
- Stephen Kolek finished with a 4.13 career ERA, going 12-10 with 150 strikeouts.
- How many strikeouts did Stephen Kolek have?
- Stephen Kolek recorded 150 career strikeouts.
- Is Stephen Kolek in the Hall of Fame?
- No. Stephen Kolek has not been inducted into the National Baseball Hall of Fame.
- What teams did Stephen Kolek play for?
- Stephen Kolek played for the San Diego Padres and the Kansas City Royals.