Jonathan Heasley was 5-11 with an ERA of 5.45 and 85 strikeouts in 36 appearances for the Royals in his career.
| 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 |  | J. Heasley | 2021 |  KCR | 3 | 1 | 1 | .500 | 3 | 4.91 | 6 | 0 | 0 | 0 | 14.2 | 15 | 8 | 8 | 3 | 3 | 2 | 0 | 0 | 59 | 0 | 3.68 | 1.84 | 2.00 | 1.84 | 10.2 | 5.1 | 1.23 | .267 | 4.91 | 109 | 6.03 | 142 | 9.20 | -3 |
| 2 | | J. Heasley | 2022 | KCR | 21 | 4 | 10 | .286 | 21 | 5.28 | 70 | 0 | 0 | 0 | 104.0 | 108 | 61 | 67 | 19 | 47 | 6 | 0 | 0 | 465 | 9 | 6.06 | 4.07 | 1.49 | 1.64 | 15.1 | 10.1 | 1.49 | .276 | 5.80 | 131 | 5.66 | 145 | 9.35 | -20.6 |
| 3 | | J. Heasley | 2023 | KCR | 12 | 0 | 0 | 0 | 7.20 | 9 | 0 | 0 | 0 | 15.0 | 17 | 12 | 13 | 5 | 2 | 1 | 5 | 0 | 63 | 1 | 5.40 | 1.20 | 4.50 | 3.00 | 14.3 | 3.2 | 1.27 | .261 | 7.80 | 160 | 6.99 | 163 | 10.20 | -4.5 | |
| Total | 36 | 5 | 11 | .313 | 24 | 5.45 | 85 | 0 | 0 | 0 | 133.2 | 140 | 81 | 88 | 27 | 52 | 9 | 5 | 0 | 587 | 10 | 5.72 | 3.50 | 1.63 | 1.82 | 14.5 | 8.9 | 1.44 | .273 | 5.93 | 132 | 5.85 | 147 | 9.43 | -28.1 |
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