Nolan Ryan has fanned the most hitters when allowing >1 run in a month, with 87 strikeouts in June 1977.
| NAME | SO | R | MONTH | G | W | L | W% | GS | ERA | CG | SHO | SV | IP | H | ER | HR | BB | HBP | GF | IBB | TBF | WP | K/9 | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | H/9 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | N. Ryan | 87 | 24 | June 1977 | 7 | 2 | 3 | .400 | 7 | 2.67 | 3 | 1 | 0 | 57.1 | 38 | 17 | 2 | 35 | 2 | 0 | 2 | 243 | 7 | 13.66 | 5.49 | 2.49 | 0.31 | 35.8 | 14.4 | 1.27 | .308 | 3.77 | 5.97 |
| 2 | | N. Ryan | 85 | 15 | August 1974 | 7 | 4 | 3 | .571 | 7 | 1.88 | 6 | 0 | 0 | 62.1 | 40 | 13 | 2 | 24 | 2 | 0 | 1 | 250 | 1 | 12.27 | 3.47 | 3.54 | 0.29 | 34.0 | 9.6 | 1.03 | .277 | 2.17 | 5.78 |
| 3 |  | R. Waddell | 85 | 30 | July 1902 | 12 | 9 | 1 | .900 | 9 | 2.26 | 9 | 1 | 0 | 99.2 | 81 | 25 | 4 | 21 | 3 | 2 | 4 | 7.68 | 1.90 | 4.05 | 0.36 | 5.9 | 1.02 | .314 | 2.71 | 7.31 | |||
| 4 | | N. Ryan | 83 | 22 | July 1972 | 8 | 4 | 4 | .500 | 8 | 3.03 | 5 | 3 | 0 | 62.1 | 32 | 21 | 6 | 28 | 2 | 0 | 0 | 244 | 4 | 11.98 | 4.04 | 2.96 | 0.87 | 34.0 | 11.5 | 0.96 | .208 | 3.18 | 4.62 |
| 5 | | R. Waddell | 81 | 18 | August 1904 | 8 | 5 | 3 | .625 | 8 | 1.85 | 7 | 1 | 0 | 78.0 | 56 | 16 | 1 | 25 | 7 | 0 | 0 | 9.35 | 2.88 | 3.24 | 0.12 | 8.7 | 1.04 | .320 | 2.08 | 6.46 | |||
| 6 | | R. Waddell | 80 | 18 | August 1905 | 11 | 8 | 1 | .889 | 8 | 6 | 4 | 0 | 74.1 | 51 | 2 | 23 | 1 | 3 | 1 | 9.69 | 2.78 | 3.48 | 0.24 | 12.1 | 1.00 | .583 | 2.18 | 6.17 | |||||
| 7 | | B. Bailey | 79 | 35 | September 1914 | 11 | 5 | 4 | .556 | 10 | 3.08 | 5 | 0 | 0 | 76.0 | 64 | 26 | 0 | 46 | 3 | 0 | 6 | 9.36 | 5.45 | 1.72 | 0.00 | 25.8 | 1.45 | 1.280 | 4.14 | 7.58 | |||
| 8 | | N. Ryan | 76 | 16 | September 1972 | 7 | 4 | 3 | .571 | 7 | 1.81 | 5 | 0 | 0 | 59.2 | 34 | 12 | 2 | 29 | 1 | 0 | 1 | 241 | 4 | 11.46 | 4.37 | 2.62 | 0.30 | 31.5 | 12.0 | 1.06 | .241 | 2.41 | 5.13 |
| 9 | | S. McDowell | 76 | 16 | May 1968 | 7 | 5 | 2 | .714 | 7 | 1.48 | 5 | 1 | 0 | 61.0 | 39 | 10 | 4 | 21 | 2 | 0 | 1 | 239 | 0 | 11.21 | 3.10 | 3.62 | 0.59 | 31.8 | 8.8 | 0.98 | .257 | 2.36 | 5.75 |
| 10 |  | S. Koufax | 76 | 18 | May 1965 | 7 | 5 | 2 | .714 | 7 | 2.05 | 4 | 1 | 0 | 61.1 | 41 | 14 | 2 | 12 | 3 | 0 | 0 | 242 | 2 | 11.15 | 1.76 | 6.33 | 0.29 | 31.4 | 5.0 | 0.86 | .262 | 2.64 | 6.02 |
| 11 |  | C. Sale | 75 | 10 | June 2015 | 6 | 2 | 2 | .500 | 6 | 1.83 | 0 | 0 | 0 | 44.1 | 28 | 9 | 2 | 8 | 1 | 0 | 0 | 170 | 1 | 15.23 | 1.62 | 9.38 | 0.41 | 44.1 | 4.7 | 0.81 | .310 | 2.03 | 5.68 |
| 12 | | N. Ryan | 75 | 23 | August 1973 | 8 | 4 | 3 | .571 | 7 | 3.22 | 4 | 1 | 0 | 58.2 | 43 | 21 | 3 | 29 | 2 | 1 | 1 | 251 | 3 | 11.51 | 4.45 | 2.59 | 0.46 | 29.9 | 11.6 | 1.23 | .282 | 3.53 | 6.60 |
| 13 |  | G. Cole | 74 | 6 | September 2019 | 6 | 5 | 0 | 1.000 | 6 | 1.07 | 0 | 0 | 0 | 42.0 | 20 | 5 | 4 | 7 | 1 | 0 | 0 | 152 | 2 | 15.86 | 1.50 | 10.57 | 0.86 | 48.7 | 4.6 | 0.64 | .242 | 1.29 | 4.29 |
| 14 | | E. Walsh | 74 | 13 | September 1908 | 13 | 9 | 4 | .692 | 12 | 11 | 6 | 0 | 107.0 | 70 | 1 | 12 | 2 | 1 | 396 | 2 | 6.22 | 1.01 | 6.17 | 0.08 | 18.7 | 3.0 | 0.77 | .225 | 1.09 | 5.89 | |||
| 15 | | F. Tanana | 73 | 23 | June 1975 | 7 | 4 | 1 | .800 | 7 | 3.53 | 3 | 0 | 0 | 58.2 | 55 | 23 | 6 | 14 | 4 | 0 | 2 | 242 | 4 | 11.20 | 2.15 | 5.21 | 0.92 | 30.2 | 5.8 | 1.18 | .338 | 3.53 | 8.44 |
| 16 | | S. Koufax | 73 | 18 | August 1965 | 8 | 4 | 2 | .667 | 7 | 2.55 | 5 | 1 | 1 | 60.0 | 38 | 17 | 5 | 14 | 0 | 1 | 3 | 233 | 4 | 10.95 | 2.10 | 5.21 | 0.75 | 31.3 | 6.0 | 0.87 | .234 | 2.70 | 5.70 |
| 17 | | S. Koufax | 73 | 10 | June 1962 | 8 | 4 | 2 | .667 | 7 | 1.23 | 4 | 2 | 1 | 58.1 | 24 | 8 | 2 | 16 | 0 | 1 | 1 | 214 | 1 | 11.26 | 2.47 | 4.56 | 0.31 | 34.1 | 7.5 | 0.69 | .179 | 1.54 | 3.70 |
| 18 | | R. Waddell | 73 | 27 | July 1903 | 9 | 5 | 3 | .625 | 9 | 2.96 | 7 | 2 | 0 | 73.0 | 67 | 24 | 1 | 26 | 2 | 0 | 5 | 9.00 | 3.21 | 2.81 | 0.12 | 10.3 | 1.27 | .440 | 3.33 | 8.26 | |||
| 19 |  | P. Martinez | 72 | 10 | June 1997 | 6 | 2 | 2 | .500 | 6 | 1.78 | 4 | 1 | 0 | 50.2 | 29 | 10 | 3 | 15 | 0 | 0 | 3 | 198 | 0 | 12.79 | 2.66 | 4.80 | 0.53 | 36.4 | 7.6 | 0.87 | .241 | 1.78 | 5.15 |
| 20 | | S. McDowell | 71 | 17 | May 1970 | 7 | 4 | 1 | .800 | 7 | 2.44 | 4 | 1 | 0 | 59.0 | 40 | 16 | 5 | 21 | 0 | 0 | 2 | 234 | 2 | 10.83 | 3.20 | 3.38 | 0.76 | 30.3 | 9.0 | 1.03 | .255 | 2.59 | 6.10 |
| 21 |  | T. Seaver | 71 | 17 | May 1970 | 7 | 3 | 4 | .429 | 7 | 2.58 | 4 | 1 | 0 | 59.1 | 39 | 17 | 7 | 20 | 1 | 0 | 3 | 234 | 1 | 10.77 | 3.03 | 3.55 | 1.06 | 30.3 | 8.5 | 0.99 | .237 | 2.58 | 5.92 |
| 22 | | S. McDowell | 71 | 23 | August 1965 | 9 | 4 | 3 | .571 | 8 | 2.73 | 4 | 0 | 1 | 59.1 | 45 | 18 | 1 | 25 | 4 | 1 | 2 | 247 | 2 | 10.77 | 3.79 | 2.84 | 0.15 | 28.7 | 10.1 | 1.18 | .301 | 3.49 | 6.83 |
| 23 | | C. Mathewson | 71 | 35 | August 1903 | 10 | 9 | 1 | .900 | 10 | 8 | 0 | 0 | 83.1 | 85 | 1 | 19 | 3 | 0 | 358 | 4 | 7.67 | 2.05 | 3.74 | 0.11 | 19.8 | 5.3 | 1.25 | .318 | 3.78 | 9.18 | |||
| 24 |  | R. Johnson | 70 | 13 | August 2002 | 6 | 4 | 1 | .800 | 6 | 2.14 | 2 | 2 | 0 | 46.1 | 29 | 11 | 3 | 14 | 4 | 0 | 1 | 184 | 1 | 13.60 | 2.72 | 5.00 | 0.58 | 38.0 | 7.6 | 0.93 | .280 | 2.53 | 5.63 |
| 25 |  | P. Martinez | 70 | 5 | September 1999 | 5 | 4 | 0 | 1.000 | 5 | 0.88 | 2 | 1 | 0 | 41.0 | 20 | 4 | 1 | 6 | 3 | 0 | 0 | 150 | 1 | 15.37 | 1.32 | 11.67 | 0.22 | 46.7 | 4.0 | 0.63 | .271 | 1.10 | 4.39 |
StatMuse has game-level data for runs allowed and strikeouts going back to the 1901 season.
Some of the information used here was obtained free of charge from Retrosheet.
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 Braves - y | 94 | 68 | .580 | |
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