8 pitchers are tied for the highest K/9 by a rookie starting pitcher, with 27.00 per nine innings. The first three are Dauri Moreta in 2022 and Jay Jackson and Cristopher Sánchez in 2021.
| NAME | K/9 | SEASON | TM | G | W | L | W% | GS | 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 |  | D. Moreta | 27.00 | 2022 |  CIN | 1 | 0 | 1 | .000 | 1 | 54.00 | 1 | 0 | 0 | 0 | 0.1 | 2 | 2 | 2 | 1 | 0 | 0 | 0 | 0 | 3 | 0 | 0.00 | 27.00 | 33.3 | 0.0 | 6.00 | 1.000 | 54.00 | 54.00 | |
| 2 | | J. Jackson | 27.00 | 2021 |  SFG | 1 | 0 | 1 | .000 | 1 | 81.00 | 1 | 0 | 0 | 0 | 0.1 | 1 | 3 | 3 | 1 | 2 | 0 | 0 | 0 | 4 | 0 | 54.00 | 0.50 | 27.00 | 25.0 | 50.0 | 9.00 | 81.00 | 27.00 | |
| 3 |  | C. Sánchez | 27.00 | 2021 |  PHI | 1 | 0 | 0 | 1 | 108.00 | 1 | 0 | 0 | 0 | 0.1 | 3 | 4 | 4 | 0 | 1 | 0 | 0 | 0 | 5 | 0 | 27.00 | 1.00 | 0.00 | 20.0 | 20.0 | 12.00 | 1.000 | 108.00 | 81.00 | |
| 4 | | J. Schultz | 27.00 | 2018 |  TBR | 1 | 0 | 1 | .000 | 1 | 54.00 | 2 | 0 | 0 | 0 | 0.2 | 2 | 4 | 4 | 1 | 2 | 0 | 0 | 0 | 6 | 1 | 27.00 | 1.00 | 13.50 | 33.3 | 33.3 | 6.00 | 1.000 | 54.00 | 27.00 |
| 5 |  | N. Ryan | 27.00 | 1966 |  NYM | 1 | 0 | 1 | .000 | 1 | 36.00 | 3 | 0 | 0 | 0 | 1.0 | 4 | 4 | 4 | 0 | 2 | 0 | 0 | 1 | 9 | 1 | 18.00 | 1.50 | 0.00 | 33.3 | 22.2 | 6.00 | 1.000 | 36.00 | 36.00 |
| 6 | | A. Kellner | 27.00 | 1948 |  PHA | 1 | 0 | 0 | 1 | 54.00 | 1 | 0 | 0 | 0 | 0.1 | 1 | 2 | 2 | 0 | 3 | 0 | 0 | 5 | 1 | 81.00 | 0.33 | 0.00 | 20.0 | 60.0 | 12.00 | 1.000 | 54.00 | 27.00 | ||
| 7 | | T. Byrne | 27.00 | 1946 |  NYY | 1 | 0 | 1 | .000 | 1 | 81.00 | 1 | 0 | 0 | 0 | 0.1 | 1 | 3 | 5 | 0 | 3 | 0 | 0 | 6 | 0 | 81.00 | 0.33 | 0.00 | 16.7 | 50.0 | 12.00 | .500 | 135.00 | 27.00 | |
| 8 | | C. Hageman | 27.00 | 1912 |  BSA | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0.1 | 2 | 2 | 0 | 3 | 0 | 0 | 6 | 0 | 81.00 | 0.33 | 0.00 | 16.7 | 50.0 | 15.00 | 1.000 | 54.00 | 54.00 | ||||
| 9 | | F. Cruz | 24.00 | 2023 | CIN | 2 | 0 | 1 | .000 | 2 | 3.00 | 8 | 0 | 0 | 0 | 3.0 | 1 | 1 | 2 | 0 | 1 | 0 | 0 | 0 | 11 | 0 | 3.00 | 8.00 | 0.00 | 72.7 | 9.1 | 0.67 | .500 | 6.00 | 3.00 |
| 10 | | D. Hernandez | 21.00 | 2019 | BOS | 1 | 0 | 1 | .000 | 1 | 9.00 | 7 | 0 | 0 | 0 | 3.0 | 3 | 3 | 4 | 0 | 5 | 0 | 0 | 0 | 18 | 0 | 15.00 | 1.40 | 0.00 | 38.9 | 27.8 | 2.67 | .500 | 12.00 | 9.00 |
| 11 | | M. Moore | 19.80 | 2011 | TBR | 1 | 1 | 0 | 1.000 | 1 | 0.00 | 11 | 0 | 0 | 0 | 5.0 | 4 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 20 | 1 | 1.80 | 11.00 | 0.00 | 55.0 | 5.0 | 1.00 | .500 | 0.00 | 7.20 |
| 12 | | R. Zeferjahn | 18.00 | 2025 |  LAA | 1 | 0 | 0 | 1 | 9.00 | 2 | 0 | 0 | 0 | 1.0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 4 | 0 | 0.00 | 9.00 | 50.0 | 0.0 | 1.00 | .000 | 9.00 | 9.00 | ||
| 13 | | J. Garza | 18.00 | 2023 | BOS | 1 | 0 | 1 | .000 | 1 | 27.00 | 2 | 0 | 0 | 0 | 1.0 | 4 | 3 | 3 | 2 | 0 | 0 | 0 | 0 | 7 | 0 | 0.00 | 18.00 | 28.6 | 0.0 | 4.00 | .667 | 27.00 | 36.00 | |
| 14 | | S. Wilson | 18.00 | 2022 |  SDP | 1 | 0 | 0 | 1 | 0.00 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 0.00 | 0.00 | 66.7 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | ||
| 15 | | A. Bellatti | 18.00 | 2022 | PHI | 1 | 0 | 0 | 1 | 18.00 | 2 | 0 | 0 | 0 | 1.0 | 2 | 2 | 2 | 0 | 1 | 0 | 0 | 0 | 5 | 0 | 9.00 | 2.00 | 0.00 | 40.0 | 20.0 | 3.00 | 1.000 | 18.00 | 18.00 | |
| 16 | | A. Wantz | 18.00 | 2022 | LAA | 1 | 0 | 0 | 1 | 0.00 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 4 | 0 | 0.00 | 0.00 | 50.0 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | ||
| 17 | | C. Greene | 18.00 | 2021 |  BAL | 1 | 0 | 0 | 1 | 0.00 | 2 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 5 | 1 | 0.00 | 0.00 | 40.0 | 0.0 | 1.00 | .500 | 0.00 | 9.00 | ||
| 18 | | B. Graterol | 18.00 | 2021 |  LAD | 1 | 0 | 0 | 1 | 18.00 | 2 | 0 | 0 | 0 | 1.0 | 2 | 2 | 2 | 1 | 0 | 0 | 0 | 0 | 5 | 0 | 0.00 | 9.00 | 40.0 | 0.0 | 2.00 | .500 | 18.00 | 18.00 | ||
| 19 | | L. Head | 18.00 | 2021 | TBR | 2 | 0 | 0 | 2 | 9.00 | 4 | 0 | 0 | 0 | 2.0 | 3 | 2 | 2 | 1 | 0 | 0 | 0 | 0 | 9 | 0 | 0.00 | 4.50 | 44.4 | 0.0 | 1.50 | .500 | 9.00 | 13.50 | ||
| 20 | | L. Oviedo | 18.00 | 2021 |  PIT | 1 | 0 | 1 | .000 | 1 | 54.00 | 2 | 0 | 0 | 0 | 1.0 | 5 | 6 | 8 | 1 | 3 | 1 | 0 | 0 | 13 | 0 | 27.00 | 0.67 | 9.00 | 15.4 | 23.1 | 8.00 | .667 | 72.00 | 45.00 |
| 21 | | R. Leyer | 18.00 | 2020 | BOS | 1 | 0 | 0 | 1 | 0.00 | 2 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 5 | 0 | 9.00 | 2.00 | 0.00 | 40.0 | 20.0 | 2.00 | .500 | 0.00 | 9.00 | |
| 22 | | M. Baez | 18.00 | 2019 |  SDP | 1 | 0 | 0 | 1 | 0.00 | 4 | 0 | 0 | 0 | 2.0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 7 | 0 | 4.50 | 4.00 | 0.00 | 57.1 | 14.3 | 0.50 | .000 | 0.00 | 0.00 | |
| 23 | | J. Taylor | 18.00 | 2019 | BOS | 1 | 0 | 0 | 1 | 0.00 | 2 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 6 | 0 | 18.00 | 1.00 | 0.00 | 33.3 | 33.3 | 3.00 | .500 | 0.00 | 9.00 | |
| 24 | | J. Fry | 18.00 | 2018 |  CWS | 1 | 0 | 1 | .000 | 1 | 9.00 | 2 | 0 | 0 | 0 | 1.0 | 2 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 6 | 0 | 9.00 | 2.00 | 9.00 | 33.3 | 16.7 | 3.00 | .500 | 9.00 | 18.00 |
| 25 | | W. Cuevas | 18.00 | 2018 | BOS | 1 | 0 | 1 | .000 | 1 | 9.00 | 4 | 0 | 0 | 0 | 2.0 | 3 | 2 | 2 | 0 | 1 | 0 | 0 | 0 | 10 | 0 | 4.50 | 4.00 | 0.00 | 40.0 | 10.0 | 2.00 | .600 | 9.00 | 13.50 |
StatMuse has game-level data for K/9 going back to the 1901 season.
Some of the information used here was obtained free of charge from Retrosheet.
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