Don Dennis played 2 seasons for the Cardinals. He had 6 wins, 5 losses, an ERA of 3.69 and 54 strikeouts.
| NAME | 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 | ERA- | FIP | FIP- | H/9 | PRAA | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | D. Dennis | 1965 |  STL | 41 | 2 | 3 | .400 | 0 | 2.29 | 29 | 0 | 0 | 6 | 55.0 | 47 | 14 | 17 | 3 | 16 | 1 | 13 | 11 | 221 | 1 | 4.75 | 2.62 | 1.81 | 0.49 | 13.1 | 7.2 | 1.15 | .256 | 2.78 | 60 | 3.10 | 84 | 7.69 | 3.6 |
| 2 | | D. Dennis | 1966 | STL | 38 | 4 | 2 | .667 | 1 | 4.98 | 25 | 0 | 0 | 2 | 59.2 | 73 | 33 | 36 | 8 | 17 | 1 | 14 | 10 | 265 | 1 | 3.77 | 2.56 | 1.47 | 1.21 | 9.4 | 6.4 | 1.51 | .304 | 5.43 | 139 | 4.36 | 126 | 11.01 | -6.1 |
| Total | 79 | 6 | 5 | .545 | 1 | 3.69 | 54 | 0 | 0 | 8 | 114.2 | 120 | 47 | 53 | 11 | 33 | 2 | 27 | 21 | 486 | 2 | 4.24 | 2.59 | 1.64 | 0.86 | 11.1 | 6.8 | 1.33 | .282 | 4.16 | 101 | 3.76 | 106 | 9.42 | -2.5 |
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