14 pitchers are tied for the highest career K/9 by a relief pitcher, with 27.00 per nine innings. The first three are Jayvien Sandridge, Will Warren and Romy González.
| NAME | K/9 | 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 |  | J. Sandridge | 27.00 | 1 | 0 | 0 | 0 | 27.00 | 2 | 0 | 0 | 0 | 0.2 | 1 | 2 | 2 | 1 | 2 | 1 | 0 | 0 | 6 | 0 | 27.00 | 1.00 | 13.50 | 33.3 | 33.3 | 4.50 | 27.00 | 13.50 | ||
| 2 | | W. Warren | 27.00 | 1 | 0 | 0 | 0 | 27.00 | 3 | 0 | 0 | 0 | 1.0 | 2 | 3 | 3 | 1 | 1 | 0 | 1 | 0 | 6 | 0 | 9.00 | 3.00 | 9.00 | 50.0 | 16.7 | 3.00 | 1.000 | 27.00 | 18.00 | |
| 3 | | R. González | 27.00 | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0.00 | 0.00 | 100.0 | 0.0 | 0.00 | 0.00 | 0.00 | |||
| 4 | | D. Valencia | 27.00 | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0.00 | 0.00 | 100.0 | 0.0 | 0.00 | 0.00 | 0.00 | |||
| 5 | | J. Bleich | 27.00 | 2 | 0 | 0 | 0 | 54.00 | 1 | 0 | 0 | 0 | 0.1 | 2 | 2 | 2 | 0 | 0 | 1 | 0 | 0 | 4 | 0 | 0.00 | 0.00 | 25.0 | 0.0 | 6.00 | 1.000 | 54.00 | 54.00 | ||
| 6 | | J. McDonald | 27.00 | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 2 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 3 | 0 | 0.00 | 0.00 | 33.3 | 0.0 | 6.00 | 1.000 | 0.00 | 54.00 | ||
| 7 | | T. Brummett | 27.00 | 1 | 0 | 0 | 0 | 0.00 | 2 | 0 | 0 | 0 | 0.2 | 2 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 4 | 0 | 0.00 | 0.00 | 50.0 | 0.0 | 3.00 | 1.000 | 0.00 | 27.00 | ||
| 8 | | S. Sheldon | 27.00 | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0.00 | 0.00 | 100.0 | 0.0 | 0.00 | 0.00 | 0.00 | |||
| 9 | | M. Whiten | 27.00 | 1 | 0 | 0 | 0 | 9.00 | 3 | 0 | 0 | 0 | 1.0 | 1 | 1 | 1 | 0 | 2 | 1 | 1 | 0 | 7 | 0 | 18.00 | 1.50 | 0.00 | 42.9 | 28.6 | 3.00 | 1.000 | 9.00 | 9.00 | |
| 10 | | R. Pickett | 27.00 | 2 | 0 | 0 | 0 | 81.00 | 2 | 0 | 0 | 0 | 0.2 | 3 | 6 | 6 | 0 | 4 | 0 | 0 | 0 | 9 | 1 | 54.00 | 0.50 | 0.00 | 22.2 | 44.4 | 10.50 | 1.000 | 81.00 | 40.50 | |
| 11 | | K. Seitzer | 27.00 | 1 | 0 | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0.00 | 0.00 | 100.0 | 0.0 | 0.00 | 0.00 | 0.00 | |||
| 12 | | F. Fisher | 27.00 | 1 | 0 | 0 | 0 | 108.00 | 1 | 0 | 0 | 0 | 0.1 | 2 | 4 | 4 | 0 | 2 | 0 | 0 | 0 | 5 | 0 | 54.00 | 0.50 | 0.00 | 20.0 | 40.0 | 12.00 | 1.000 | 108.00 | 54.00 | |
| 13 | | J. Cleary | 27.00 | 1 | 0 | 0 | 0 | 189.00 | 1 | 0 | 0 | 0 | 0.1 | 5 | 7 | 7 | 0 | 3 | 0 | 0 | 9 | 1 | 81.00 | 0.33 | 0.00 | 11.1 | 33.3 | 24.00 | 1.000 | 189.00 | 135.00 | ||
| 14 | | J. Mosolf | 27.00 | 1 | 0 | 0 | 0 | 27.00 | 1 | 0 | 0 | 0 | 0.1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 2 | 0 | 0.00 | 0.00 | 50.0 | 0.0 | 3.00 | 1.000 | 27.00 | 27.00 | |||
| 15 | | C. Nieson | 22.50 | 2 | 0 | 0 | 0 | 4.50 | 5 | 0 | 0 | 0 | 2.0 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 0 | 8 | 0 | 4.50 | 5.00 | 4.50 | 62.5 | 12.5 | 1.00 | .000 | 4.50 | 4.50 | |
| 16 | | A.J. Burnett | 21.00 | 5 | 0 | 1 | .000 | 0 | 10.50 | 14 | 0 | 0 | 0 | 6.0 | 9 | 7 | 7 | 0 | 4 | 0 | 1 | 1 | 31 | 3 | 6.00 | 3.50 | 0.00 | 45.2 | 12.9 | 2.17 | .692 | 10.50 | 13.50 |
| 17 | | L. Biittner | 20.25 | 1 | 0 | 0 | 0 | 40.50 | 3 | 0 | 0 | 0 | 1.1 | 5 | 6 | 6 | 3 | 1 | 0 | 1 | 0 | 10 | 0 | 6.75 | 3.00 | 20.25 | 30.0 | 10.0 | 4.50 | .667 | 40.50 | 33.75 | |
| 18 | | R. Nye | 19.29 | 3 | 0 | 0 | 0 | 27.00 | 5 | 0 | 0 | 0 | 2.1 | 10 | 7 | 7 | 2 | 0 | 0 | 2 | 0 | 17 | 0 | 0.00 | 7.71 | 29.4 | 0.0 | 4.29 | .800 | 27.00 | 38.57 | ||
| 19 |  | R. Sasaki | 18.00 | 2 | 0 | 0 | 0 | 0.00 | 4 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 0.00 | 0.00 | 57.1 | 0.0 | 0.50 | .333 | 0.00 | 4.50 | ||
| 20 | | N. Hoffman | 18.00 | 1 | 0 | 0 | 0 | 27.00 | 2 | 0 | 0 | 0 | 1.0 | 3 | 3 | 3 | 0 | 1 | 0 | 1 | 0 | 7 | 1 | 9.00 | 2.00 | 0.00 | 28.6 | 14.3 | 4.00 | .750 | 27.00 | 27.00 | |
| 21 | | D. Nikhazy | 18.00 | 1 | 0 | 0 | 0 | 0.00 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 3 | 0 | 0.00 | 0.00 | 66.7 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | ||
| 22 | | L. Allen | 18.00 | 1 | 1 | 0 | 1.000 | 0 | 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 | |
| 23 |  | CC Sabathia | 18.00 | 1 | 0 | 0 | 0 | 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 | ||
| 24 | | A. Altherr | 18.00 | 1 | 0 | 0 | 0 | 9.00 | 2 | 0 | 0 | 0 | 1.0 | 2 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 5 | 0 | 0.00 | 0.00 | 40.0 | 0.0 | 2.00 | .667 | 9.00 | 18.00 | ||
| 25 | | A. McCreery | 18.00 | 1 | 0 | 0 | 0 | 18.00 | 2 | 0 | 0 | 0 | 1.0 | 4 | 2 | 2 | 0 | 0 | 0 | 1 | 0 | 7 | 0 | 0.00 | 0.00 | 28.6 | 0.0 | 4.00 | .800 | 18.00 | 36.00 | ||
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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