Between April 30, 2025 and June 14, 2025, Lance McCullers Jr. has the highest K/9 by an Astros starting pitcher when starting 2+ games, with 11.97 per nine innings.
| NAME | K/9 | GS | G | W | L | W% | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | H/9 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | L. McCullers Jr. | 11.97 | 7 | 7 | 1 | 2 | .333 | 4.91 | 39 | 0 | 0 | 0 | 29.1 | 26 | 16 | 18 | 4 | 16 | 4 | 0 | 0 | 137 | 1 | 4.91 | 2.44 | 1.23 | 28.5 | 11.7 | 1.43 | .297 | 5.52 | 7.98 |
| 2 |  | H. Brown | 11.36 | 7 | 7 | 4 | 2 | .667 | 2.36 | 53 | 1 | 0 | 0 | 42.0 | 27 | 11 | 11 | 5 | 18 | 1 | 0 | 0 | 165 | 0 | 3.86 | 2.94 | 1.07 | 32.1 | 10.9 | 1.07 | .250 | 2.36 | 5.79 |
| 3 |  | F. Valdez | 10.83 | 8 | 8 | 6 | 1 | .857 | 2.50 | 65 | 1 | 0 | 0 | 54.0 | 40 | 15 | 15 | 3 | 15 | 2 | 0 | 0 | 211 | 3 | 2.50 | 4.33 | 0.50 | 30.8 | 7.1 | 1.02 | .294 | 2.50 | 6.67 |
| 4 | | R. Blanco | 9.90 | 3 | 3 | 1 | 2 | .333 | 2.70 | 22 | 0 | 0 | 0 | 20.0 | 14 | 6 | 6 | 2 | 6 | 0 | 0 | 0 | 79 | 0 | 2.70 | 3.67 | 0.90 | 27.8 | 7.6 | 1.00 | .245 | 2.70 | 6.30 |
| 5 | | R. Gusto | 9.58 | 5 | 5 | 1 | 2 | .333 | 6.97 | 22 | 0 | 0 | 0 | 20.2 | 30 | 16 | 16 | 3 | 12 | 1 | 0 | 0 | 103 | 0 | 5.23 | 1.83 | 1.31 | 21.4 | 11.7 | 2.03 | .415 | 6.97 | 13.06 |
| 6 | | C. Gordon | 9.12 | 5 | 5 | 1 | 1 | .500 | 5.11 | 25 | 0 | 0 | 0 | 24.2 | 31 | 14 | 14 | 4 | 3 | 1 | 0 | 2 | 106 | 1 | 1.09 | 8.33 | 1.46 | 23.6 | 2.8 | 1.38 | .370 | 5.11 | 11.31 |
| 7 | | B. Walter | 8.18 | 2 | 2 | 0 | 0 | 1.64 | 10 | 0 | 0 | 0 | 11.0 | 9 | 2 | 2 | 1 | 1 | 0 | 0 | 0 | 42 | 0 | 0.82 | 10.00 | 0.82 | 23.8 | 2.4 | 0.91 | .267 | 1.64 | 7.36 |
StatMuse has game-level data for K/9 and starts going back to the 1901 season.
Some of the information used here was obtained free of charge from Retrosheet.
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