Roger Clemens, Dennys Reyes and Paul Spoljaric were tied for the highest K/9 when starting 1+ game in September 1998, with 13.50 per nine innings.
| NAME | K/9 | GS | MONTH | 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 |  | R. Clemens | 13.50 | 5 | September 1998 | 5 | 3 | 0 | 1.000 | 2.70 | 55 | 0 | 0 | 0 | 36.2 | 28 | 11 | 11 | 3 | 13 | 2 | 0 | 0 | 149 | 2 | 3.19 | 4.23 | 0.74 | 36.9 | 8.7 | 1.12 | .329 | 2.70 | 6.87 |
| 2 |  | D. Reyes | 13.50 | 1 | September 1998 | 1 | 0 | 1 | .000 | 9.00 | 6 | 0 | 0 | 0 | 4.0 | 5 | 4 | 4 | 1 | 2 | 0 | 0 | 0 | 19 | 1 | 4.50 | 3.00 | 2.25 | 31.6 | 10.5 | 1.75 | .400 | 9.00 | 11.25 |
| 3 | | P. Spoljaric | 13.50 | 2 | September 1998 | 2 | 0 | 2 | .000 | 8.59 | 11 | 0 | 0 | 0 | 7.1 | 13 | 7 | 13 | 4 | 6 | 0 | 0 | 0 | 41 | 1 | 7.36 | 1.83 | 4.91 | 26.8 | 14.6 | 2.59 | .450 | 15.95 | 15.95 |
| 4 |  | R. Johnson | 12.43 | 6 | September 1998 | 6 | 5 | 1 | .833 | 1.55 | 64 | 1 | 1 | 0 | 46.1 | 35 | 8 | 8 | 2 | 16 | 1 | 0 | 1 | 185 | 0 | 3.11 | 4.00 | 0.39 | 34.6 | 8.6 | 1.10 | .324 | 1.55 | 6.80 |
| 5 | | D. Cone | 12.03 | 5 | September 1998 | 5 | 2 | 3 | .400 | 2.94 | 45 | 0 | 0 | 0 | 33.2 | 32 | 11 | 11 | 3 | 8 | 1 | 0 | 0 | 136 | 1 | 2.14 | 5.63 | 0.80 | 33.1 | 5.9 | 1.19 | .367 | 2.94 | 8.55 |
| 6 |  | P. Martinez | 11.02 | 6 | September 1998 | 6 | 2 | 3 | .400 | 4.10 | 51 | 0 | 0 | 0 | 41.2 | 35 | 19 | 22 | 6 | 15 | 0 | 0 | 2 | 175 | 5 | 3.24 | 3.40 | 1.30 | 29.1 | 8.6 | 1.20 | .282 | 4.75 | 7.56 |
| 7 | | S. Lawrence | 10.80 | 1 | September 1998 | 1 | 0 | 1 | .000 | 9.00 | 6 | 0 | 0 | 0 | 5.0 | 7 | 5 | 5 | 1 | 3 | 0 | 0 | 0 | 25 | 0 | 5.40 | 2.00 | 1.80 | 24.0 | 12.0 | 2.00 | .400 | 9.00 | 12.60 |
| 8 | | K. Bottenfield | 10.50 | 1 | September 1998 | 1 | 0 | 0 | 3.00 | 7 | 0 | 0 | 0 | 6.0 | 5 | 2 | 2 | 1 | 1 | 0 | 0 | 0 | 24 | 0 | 1.50 | 7.00 | 1.50 | 29.2 | 4.2 | 1.00 | .267 | 3.00 | 7.50 | |
| 9 | | D. Dreifort | 10.29 | 1 | September 1998 | 1 | 1 | 0 | 1.000 | 5.14 | 8 | 0 | 0 | 0 | 7.0 | 8 | 4 | 4 | 2 | 4 | 0 | 0 | 0 | 31 | 0 | 5.14 | 2.00 | 2.57 | 25.8 | 12.9 | 1.71 | .353 | 5.14 | 10.29 |
| 10 | | J. Sanchez | 10.23 | 5 | September 1998 | 5 | 1 | 2 | .333 | 6.25 | 36 | 0 | 0 | 0 | 31.2 | 30 | 22 | 23 | 4 | 22 | 1 | 0 | 0 | 144 | 1 | 6.25 | 1.64 | 1.14 | 25.0 | 15.3 | 1.64 | .321 | 6.54 | 8.53 |
| 11 | | K. Brown | 10.20 | 6 | September 1998 | 6 | 2 | 2 | .500 | 1.80 | 51 | 1 | 0 | 0 | 45.0 | 28 | 9 | 12 | 1 | 8 | 3 | 0 | 1 | 171 | 1 | 1.60 | 6.38 | 0.20 | 29.8 | 4.7 | 0.80 | .250 | 2.40 | 5.60 |
| 12 |  | J. Smoltz | 10.13 | 5 | September 1998 | 5 | 5 | 0 | 1.000 | 0.78 | 39 | 1 | 1 | 0 | 34.2 | 18 | 3 | 3 | 1 | 5 | 0 | 0 | 0 | 126 | 0 | 1.30 | 7.80 | 0.26 | 31.0 | 4.0 | 0.66 | .210 | 0.78 | 4.67 |
| 13 | | C. Schilling | 9.95 | 5 | September 1998 | 5 | 2 | 2 | .500 | 3.32 | 42 | 2 | 0 | 0 | 38.0 | 36 | 14 | 15 | 4 | 8 | 1 | 0 | 0 | 155 | 0 | 1.89 | 5.25 | 0.95 | 27.1 | 5.2 | 1.16 | .320 | 3.55 | 8.53 |
| 14 | | M. Remlinger | 9.92 | 3 | September 1998 | 3 | 1 | 1 | .500 | 6.06 | 18 | 0 | 0 | 0 | 16.1 | 12 | 11 | 11 | 3 | 9 | 0 | 0 | 0 | 70 | 3 | 4.96 | 2.00 | 1.65 | 25.7 | 12.9 | 1.29 | .225 | 6.06 | 6.61 |
| 15 | | B. Witt | 9.82 | 1 | September 1998 | 1 | 0 | 1 | .000 | 14.73 | 4 | 0 | 0 | 0 | 3.2 | 6 | 6 | 6 | 3 | 1 | 0 | 0 | 0 | 18 | 0 | 2.45 | 4.00 | 7.36 | 22.2 | 5.6 | 1.91 | .300 | 14.73 | 14.73 |
| 16 | | B. Jones | 9.82 | 3 | September 1998 | 3 | 0 | 1 | .000 | 5.40 | 20 | 0 | 0 | 0 | 18.1 | 20 | 11 | 12 | 1 | 11 | 1 | 0 | 0 | 86 | 0 | 5.40 | 1.82 | 0.49 | 23.3 | 12.8 | 1.69 | .358 | 5.89 | 9.82 |
| 17 | | J. Wright | 9.77 | 6 | September 1998 | 6 | 1 | 3 | .250 | 5.40 | 38 | 0 | 0 | 0 | 35.0 | 34 | 21 | 21 | 5 | 15 | 5 | 0 | 0 | 157 | 0 | 3.86 | 2.53 | 1.29 | 24.2 | 9.6 | 1.40 | .309 | 5.40 | 8.74 |
| 18 | | D. Wells | 9.58 | 6 | September 1998 | 6 | 3 | 2 | .600 | 3.27 | 44 | 2 | 1 | 0 | 41.1 | 36 | 15 | 16 | 1 | 5 | 1 | 0 | 0 | 165 | 0 | 1.09 | 8.80 | 0.22 | 26.7 | 3.0 | 0.99 | .307 | 3.48 | 7.84 |
| 19 | | D. Hermanson | 9.49 | 5 | September 1998 | 5 | 2 | 1 | .667 | 2.67 | 32 | 0 | 0 | 0 | 30.1 | 25 | 9 | 11 | 2 | 6 | 0 | 0 | 0 | 119 | 0 | 1.78 | 5.33 | 0.59 | 26.9 | 5.0 | 1.02 | .291 | 3.26 | 7.42 |
| 20 | | C. Fussell | 9.45 | 2 | September 1998 | 2 | 0 | 1 | .000 | 9.45 | 7 | 0 | 0 | 0 | 6.2 | 7 | 7 | 7 | 1 | 9 | 0 | 0 | 1 | 34 | 0 | 12.15 | 0.78 | 1.35 | 20.6 | 26.5 | 2.40 | .353 | 9.45 | 9.45 |
| 21 | | J. Suppan | 9.00 | 1 | September 1998 | 1 | 0 | 0 | 0.00 | 6 | 0 | 0 | 0 | 6.0 | 4 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 22 | 0 | 1.50 | 6.00 | 0.00 | 27.3 | 4.5 | 0.83 | .267 | 0.00 | 6.00 | |
| 22 | | B. Sampson | 9.00 | 2 | September 1998 | 2 | 1 | 0 | 1.000 | 2.08 | 13 | 0 | 0 | 0 | 13.0 | 8 | 3 | 3 | 0 | 4 | 1 | 0 | 0 | 51 | 2 | 2.77 | 3.25 | 0.00 | 25.5 | 7.8 | 0.92 | .242 | 2.08 | 5.54 |
| 23 | | K. Millwood | 9.00 | 4 | September 1998 | 4 | 3 | 0 | 1.000 | 1.88 | 24 | 0 | 0 | 0 | 24.0 | 30 | 5 | 7 | 1 | 7 | 1 | 0 | 0 | 109 | 0 | 2.63 | 3.43 | 0.38 | 22.0 | 6.4 | 1.54 | .382 | 2.63 | 11.25 |
| 24 | | S. Spencer | 8.74 | 4 | September 1998 | 4 | 0 | 0 | 5.96 | 22 | 0 | 0 | 0 | 22.2 | 24 | 15 | 15 | 5 | 3 | 0 | 0 | 0 | 94 | 0 | 1.19 | 7.33 | 1.99 | 23.4 | 3.2 | 1.19 | .297 | 5.96 | 9.53 | |
| 25 | | B. Bohanon | 8.72 | 4 | September 1998 | 4 | 1 | 3 | .250 | 2.53 | 31 | 2 | 0 | 0 | 32.0 | 25 | 9 | 9 | 2 | 14 | 2 | 0 | 0 | 130 | 1 | 3.94 | 2.21 | 0.56 | 23.8 | 10.8 | 1.22 | .284 | 2.53 | 7.03 |
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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