6 pitchers are tied for giving up the most grand slams in a season, with 4 grand slams. The first three are J.A. Happ in 2018, Brian Bannister in 2008 and Matt Clement in 2000.
| NAME | GRANDSLAM | SEASON | TM | G | W | L | W% | GS | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | K/9 | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | H/9 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | J.A. Happ | 4 | 2018 | TOT | 31 | 17 | 6 | .739 | 31 | 3.65 | 193 | 0 | 0 | 0 | 177.2 | 150 | 72 | 81 | 27 | 51 | 9 | 0 | 0 | 733 | 4 | 9.78 | 2.58 | 3.78 | 1.37 | 26.3 | 7.0 | 1.13 | .272 | 4.10 | 7.60 |
| 2 |  | B. Bannister | 4 | 2008 | 32 | 9 | 16 | .360 | 32 | 5.76 | 113 | 1 | 0 | 0 | 182.2 | 215 | 117 | 127 | 29 | 58 | 7 | 0 | 1 | 811 | 7 | 5.57 | 2.86 | 1.95 | 1.43 | 13.9 | 7.2 | 1.49 | .308 | 6.26 | 10.59 | |
| 3 | | M. Clement | 4 | 2000 | 34 | 13 | 17 | .433 | 34 | 5.14 | 170 | 0 | 0 | 0 | 205.0 | 194 | 117 | 131 | 22 | 125 | 16 | 0 | 4 | 940 | 23 | 7.46 | 5.49 | 1.36 | 0.97 | 18.1 | 13.3 | 1.56 | .283 | 5.75 | 8.52 | |
| 4 | | C. Ho Park | 4 | 1999 | 33 | 13 | 11 | .542 | 33 | 5.23 | 174 | 0 | 0 | 0 | 194.1 | 208 | 113 | 120 | 31 | 100 | 14 | 0 | 4 | 883 | 11 | 8.06 | 4.63 | 1.74 | 1.44 | 19.7 | 11.3 | 1.58 | .314 | 5.56 | 9.63 | |
| 5 | | M. Schooler | 4 | 1992 | 53 | 2 | 7 | .222 | 0 | 4.70 | 33 | 0 | 0 | 13 | 51.2 | 55 | 27 | 29 | 7 | 24 | 1 | 36 | 6 | 232 | 0 | 5.75 | 4.18 | 1.38 | 1.22 | 14.2 | 10.3 | 1.53 | .287 | 5.05 | 9.58 | |
| 6 | | T. McGraw | 4 | 1979 | 65 | 4 | 3 | .571 | 1 | 5.16 | 57 | 0 | 0 | 16 | 83.2 | 83 | 48 | 56 | 9 | 29 | 2 | 43 | 7 | 357 | 2 | 6.13 | 3.12 | 1.97 | 0.97 | 16.0 | 8.1 | 1.34 | .285 | 6.02 | 8.93 | |
| 7 |  | E. Cabrera | 3 | 2024 | 20 | 4 | 8 | .333 | 20 | 4.95 | 107 | 0 | 0 | 0 | 96.1 | 82 | 53 | 60 | 15 | 50 | 5 | 0 | 0 | 418 | 1 | 10.00 | 4.67 | 2.14 | 1.40 | 25.6 | 12.0 | 1.37 | .278 | 5.61 | 7.66 | |
| 8 | | A. Gomber | 3 | 2022 | 33 | 5 | 7 | .417 | 17 | 5.56 | 95 | 0 | 0 | 0 | 124.2 | 137 | 77 | 80 | 20 | 34 | 2 | 2 | 1 | 529 | 4 | 6.86 | 2.45 | 2.79 | 1.44 | 18.0 | 6.4 | 1.37 | .310 | 5.78 | 9.89 | |
| 9 |  | Z. Davies | 3 | 2021 | 32 | 6 | 12 | .333 | 32 | 5.78 | 114 | 0 | 0 | 0 | 148.0 | 162 | 95 | 99 | 25 | 75 | 5 | 0 | 2 | 668 | 0 | 6.93 | 4.56 | 1.52 | 1.52 | 17.1 | 11.2 | 1.60 | .305 | 6.02 | 9.85 | |
| 10 | | A. Heaney | 3 | 2018 | 30 | 9 | 10 | .474 | 30 | 4.15 | 180 | 1 | 1 | 0 | 180.0 | 171 | 83 | 91 | 27 | 45 | 8 | 0 | 0 | 749 | 9 | 9.00 | 2.25 | 4.00 | 1.35 | 24.0 | 6.0 | 1.20 | .294 | 4.55 | 8.55 | |
| 11 | | J. Hammel | 3 | 2018 | 39 | 4 | 14 | .222 | 18 | 6.02 | 92 | 0 | 0 | 0 | 127.0 | 168 | 85 | 91 | 18 | 39 | 3 | 14 | 4 | 583 | 3 | 6.52 | 2.76 | 2.36 | 1.28 | 15.8 | 6.7 | 1.63 | .348 | 6.45 | 11.91 | |
| 12 | | C. Buchholz | 3 | 2016 | 37 | 8 | 10 | .444 | 21 | 4.78 | 93 | 0 | 0 | 0 | 139.1 | 130 | 74 | 80 | 21 | 55 | 5 | 7 | 1 | 588 | 1 | 6.01 | 3.55 | 1.69 | 1.36 | 15.8 | 9.4 | 1.33 | .263 | 5.17 | 8.40 | |
| 13 | | B. Norris | 3 | 2016 | TOT | 35 | 6 | 10 | .375 | 19 | 5.10 | 102 | 0 | 0 | 0 | 113.0 | 116 | 64 | 67 | 14 | 49 | 3 | 1 | 4 | 495 | 7 | 8.12 | 3.90 | 2.08 | 1.12 | 20.6 | 9.9 | 1.46 | .312 | 5.34 | 9.24 |
| 14 | | J.J. Hoover | 3 | 2013 | 69 | 5 | 5 | .500 | 0 | 2.86 | 67 | 0 | 0 | 3 | 66.0 | 47 | 21 | 21 | 6 | 26 | 2 | 23 | 6 | 269 | 1 | 9.14 | 3.55 | 2.58 | 0.82 | 24.9 | 9.7 | 1.11 | .244 | 2.86 | 6.41 | |
| 15 | | J. Frasor | 3 | 2012 | 50 | 1 | 1 | .500 | 0 | 4.12 | 53 | 0 | 0 | 0 | 43.2 | 42 | 20 | 20 | 6 | 22 | 2 | 9 | 1 | 191 | 5 | 10.92 | 4.53 | 2.41 | 1.24 | 27.7 | 11.5 | 1.47 | .333 | 4.12 | 8.66 | |
| 16 | | R. Dempster | 3 | 2011 | 34 | 10 | 14 | .417 | 34 | 4.80 | 191 | 0 | 0 | 0 | 202.1 | 211 | 108 | 111 | 23 | 82 | 5 | 0 | 2 | 881 | 7 | 8.50 | 3.65 | 2.33 | 1.02 | 21.7 | 9.3 | 1.45 | .324 | 4.94 | 9.39 | |
| 17 | | T. Cahill | 3 | 2010 | 30 | 18 | 8 | .692 | 30 | 2.97 | 118 | 1 | 1 | 0 | 196.2 | 155 | 65 | 73 | 19 | 63 | 6 | 0 | 1 | 783 | 2 | 5.40 | 2.88 | 1.87 | 0.87 | 15.1 | 8.0 | 1.11 | .236 | 3.34 | 7.09 | |
| 18 | | J. Santana | 3 | 2010 | 29 | 11 | 9 | .550 | 29 | 2.98 | 144 | 4 | 2 | 0 | 199.0 | 179 | 66 | 67 | 16 | 55 | 2 | 0 | 2 | 817 | 2 | 6.51 | 2.49 | 2.62 | 0.72 | 17.6 | 6.7 | 1.18 | .272 | 3.03 | 8.10 | |
| 19 | | J. Bulger | 3 | 2009 | 64 | 6 | 1 | .857 | 0 | 3.56 | 68 | 0 | 0 | 1 | 65.2 | 46 | 26 | 26 | 7 | 30 | 1 | 20 | 1 | 262 | 5 | 9.32 | 4.11 | 2.27 | 0.96 | 26.0 | 11.5 | 1.16 | .250 | 3.56 | 6.30 | |
| 20 | | D. Bush | 3 | 2008 | 31 | 9 | 10 | .474 | 29 | 4.18 | 109 | 0 | 0 | 0 | 185.0 | 163 | 86 | 92 | 29 | 48 | 10 | 0 | 3 | 763 | 2 | 5.30 | 2.34 | 2.27 | 1.41 | 14.3 | 6.3 | 1.14 | .236 | 4.48 | 7.93 | |
| 21 | | B. Backe | 3 | 2008 | 31 | 9 | 14 | .391 | 31 | 6.05 | 127 | 0 | 0 | 0 | 166.2 | 202 | 112 | 114 | 36 | 77 | 4 | 0 | 2 | 756 | 2 | 6.86 | 4.16 | 1.65 | 1.94 | 16.8 | 10.2 | 1.67 | .324 | 6.16 | 10.91 | |
| 22 | | A. Reyes | 3 | 2007 | 22 | 2 | 14 | .125 | 20 | 6.04 | 74 | 1 | 0 | 0 | 107.1 | 108 | 72 | 77 | 16 | 43 | 9 | 1 | 0 | 474 | 1 | 6.20 | 3.61 | 1.72 | 1.34 | 15.6 | 9.1 | 1.41 | .277 | 6.46 | 9.06 | |
| 23 | | O. Perez | 3 | 2006 | TOT | 32 | 6 | 8 | .429 | 20 | 6.20 | 81 | 0 | 0 | 0 | 126.1 | 169 | 87 | 93 | 18 | 31 | 3 | 6 | 2 | 573 | 6 | 5.77 | 2.21 | 2.61 | 1.28 | 14.1 | 5.4 | 1.58 | .343 | 6.63 | 12.04 |
| 24 | | J. Weaver | 3 | 2006 | TOT | 31 | 8 | 14 | .364 | 31 | 5.76 | 107 | 0 | 0 | 0 | 172.0 | 213 | 110 | 117 | 34 | 47 | 10 | 0 | 1 | 770 | 5 | 5.60 | 2.46 | 2.28 | 1.78 | 13.9 | 6.1 | 1.51 | .313 | 6.12 | 11.15 |
| 25 | | O. Perez | 3 | 2006 | TOT | 22 | 3 | 13 | .188 | 22 | 6.55 | 102 | 1 | 1 | 0 | 112.2 | 129 | 82 | 90 | 20 | 68 | 6 | 0 | 0 | 529 | 5 | 8.15 | 5.43 | 1.50 | 1.60 | 19.3 | 12.9 | 1.75 | .327 | 7.19 | 10.30 |
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STLStatMuse has game-level data for grand slams allowed going back to the 1920 season.
Some of the information used here was obtained free of charge from Retrosheet.
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