J.J. Niekro
(A+)P
Age: 28
Bats/Throws: R/R
6'0" / 185
DOB: 1/28/1998
(28 years, 8 months, 7 days)
P
Player Dashboard:
Quick Links
More
Stats
Stat Groups:
Select
You can shift + click on full MLB seasons in Season Stats and games in Game Logs to select spans for aggregate stats. Read more here
Heat Map:
Off
On
Preseason ProjectionsMinor LeaguesSpring Training
| Season | Team | Level | Age | W | L | SV | G | GS | IP | divider | K/9 | BB/9 | HR/9 | BABIP | LOB% | GB% | HR/FB | divider | vFA | divider | ERA | xERA | FIP | xFIP | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | ATL | CPX | 23 | 2 | 0 | 0 | 10 | 0 | 16.1 | 12.67 | 4.96 | 0.00 | .383 | 40.7% | 45.2% | 0.0% | 2.76 | 2.99 | 4.21 | ||||||
| 2022 | ATL | A | 24 | 7 | 1 | 0 | 15 | 8 | 73.1 | 9.45 | 2.09 | 0.74 | .283 | 84.3% | 51.3% | 10.7% | 2.09 | 3.55 | 3.39 | ||||||
| 2022 | ATL | A+ | 24 | 3 | 2 | 0 | 9 | 9 | 48.0 | 6.94 | 3.00 | 0.94 | .329 | 66.1% | 51.4% | 11.6% | 4.88 | 4.53 | 4.50 | ||||||
| 2022 | ATL | MiLB | 24 | 10 | 3 | 0 | 24 | 17 | 121.1 | 8.46 | 2.45 | 0.82 | .303 | 75.6% | 51.4% | 11.1% | 3.19 | 3.94 | 3.83 | ||||||
| 2023 | ATL | A+ | 25 | 4 | 4 | 0 | 31 | 7 | 84.2 | 7.97 | 3.83 | 1.17 | .342 | 68.9% | 44.5% | 13.1% | 4.89 | 5.07 | 4.77 | ||||||
| 2024 | ATL | AA | 26 | 1 | 4 | 0 | 8 | 8 | 40.1 | 8.03 | 3.12 | 0.67 | .310 | 64.9% | 46.9% | 7.3% | 4.02 | 3.53 | 3.69 | ||||||
| 2024 | ATL | ST | 26 | 0 | 0 | 0 | 1 | 0 | 1.1 | 13.50 | 0.00 | 0.00 | .000 | 100.0% | 100.0% | 0.0% | 0.00 | 0.74 | 0.74 | ||||||
| 2025 | ATL | CPX | 27 | 0 | 0 | 0 | 3 | 1 | 6.1 | 11.37 | 2.84 | 0.00 | .438 | 55.6% | 62.5% | 0.0% | 5.68 | 1.99 | 2.12 | ||||||
| 2025 | ATL | A+ | 27 | 0 | 1 | 0 | 3 | 0 | 6.1 | 9.95 | 9.95 | 1.42 | .286 | 66.0% | 28.6% | 16.7% | 7.11 | 6.55 | 5.52 | ||||||
| 2025 | ATL | MiLB | 27 | 0 | 1 | 0 | 6 | 1 | 12.2 | 10.66 | 6.39 | 0.71 | .367 | 61.2% | 46.7% | 14.3% | 6.39 | 4.27 | 3.82 | ||||||
| 2026 | Steamer | PROJ | 28 | 0 | 0 | 0 | 1 | 0 | 1.0 | 6.79 | 3.74 | 1.29 | .301 | 70.6% | 43.3% | 4.84 | 4.85 | 4.77 | 0.0 | ||||||
| 2026 | OOPSY | PROJ | 28 | 0 | 0 | 0 | 1 | 1 | 3.3 | 5.56 | 4.17 | 1.34 | .291 | 64.3% | 5.50 | 5.38 | 0.0 |
| Season | Team | Level | Age | W | L | SV | G | GS | IP | divider | K/9 | BB/9 | HR/9 | BABIP | LOB% | GB% | HR/FB | divider | vFA | divider | ERA | xERA | FIP | xFIP | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | ATL | CPX | 23 | 2 | 0 | 0 | 10 | 0 | 16.1 | 12.67 | 4.96 | 0.00 | .383 | 40.7% | 45.2% | 0.0% | 2.76 | 2.99 | 4.21 | ||||||
| 2022 | ATL | A | 24 | 7 | 1 | 0 | 15 | 8 | 73.1 | 9.45 | 2.09 | 0.74 | .283 | 84.3% | 51.3% | 10.7% | 2.09 | 3.55 | 3.39 | ||||||
| 2022 | ATL | A+ | 24 | 3 | 2 | 0 | 9 | 9 | 48.0 | 6.94 | 3.00 | 0.94 | .329 | 66.1% | 51.4% | 11.6% | 4.88 | 4.53 | 4.50 | ||||||
| 2022 | ATL | MiLB | 24 | 10 | 3 | 0 | 24 | 17 | 121.1 | 8.46 | 2.45 | 0.82 | .303 | 75.6% | 51.4% | 11.1% | 3.19 | 3.94 | 3.83 | ||||||
| 2023 | ATL | A+ | 25 | 4 | 4 | 0 | 31 | 7 | 84.2 | 7.97 | 3.83 | 1.17 | .342 | 68.9% | 44.5% | 13.1% | 4.89 | 5.07 | 4.77 | ||||||
| 2024 | ATL | AA | 26 | 1 | 4 | 0 | 8 | 8 | 40.1 | 8.03 | 3.12 | 0.67 | .310 | 64.9% | 46.9% | 7.3% | 4.02 | 3.53 | 3.69 | ||||||
| 2024 | ATL | ST | 26 | 0 | 0 | 0 | 1 | 0 | 1.1 | 13.50 | 0.00 | 0.00 | .000 | 100.0% | 100.0% | 0.0% | 0.00 | 0.74 | 0.74 | ||||||
| 2025 | ATL | CPX | 27 | 0 | 0 | 0 | 3 | 1 | 6.1 | 11.37 | 2.84 | 0.00 | .438 | 55.6% | 62.5% | 0.0% | 5.68 | 1.99 | 2.12 | ||||||
| 2025 | ATL | A+ | 27 | 0 | 1 | 0 | 3 | 0 | 6.1 | 9.95 | 9.95 | 1.42 | .286 | 66.0% | 28.6% | 16.7% | 7.11 | 6.55 | 5.52 | ||||||
| 2025 | ATL | MiLB | 27 | 0 | 1 | 0 | 6 | 1 | 12.2 | 10.66 | 6.39 | 0.71 | .367 | 61.2% | 46.7% | 14.3% | 6.39 | 4.27 | 3.82 | ||||||
| 2026 | Steamer | PROJ | 28 | 0 | 0 | 0 | 1 | 0 | 1.0 | 6.79 | 3.74 | 1.29 | .301 | 70.6% | 43.3% | 4.84 | 4.85 | 4.77 | 0.0 | ||||||
| 2026 | OOPSY | PROJ | 28 | 0 | 0 | 0 | 1 | 1 | 3.3 | 5.56 | 4.17 | 1.34 | .291 | 64.3% | 5.50 | 5.38 | 0.0 |
Preseason ProjectionsMinor LeaguesSpring Training
| Season | Team | Level | W | L | ERA | G | GS | QS | CG | ShO | SV | HLD | BS | IP | TBF | H | R | ER | HR | BB | IBB | HBP | WP | BK | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | ATL | CPX | 2 | 0 | 2.76 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 16.1 | 79 | 18 | 16 | 5 | 0 | 9 | 0 | 0 | 3 | 1 | 23 | |
| 2022 | ATL | A | 7 | 1 | 2.09 | 15 | 8 | 0 | 0 | 0 | 0 | 0 | 73.1 | 285 | 58 | 19 | 17 | 6 | 17 | 0 | 1 | 4 | 1 | 77 | |
| 2022 | ATL | A+ | 3 | 2 | 4.88 | 9 | 9 | 0 | 0 | 0 | 0 | 0 | 48.0 | 202 | 52 | 28 | 26 | 5 | 16 | 0 | 1 | 5 | 0 | 37 | |
| 2022 | ATL | MiLB | 10 | 3 | 3.19 | 24 | 17 | 0 | 0 | 0 | 0 | 0 | 121.1 | 487 | 110 | 47 | 43 | 11 | 33 | 0 | 2 | 9 | 1 | 114 | |
| 2023 | ATL | A+ | 4 | 4 | 4.89 | 31 | 7 | 0 | 0 | 0 | 4 | 1 | 84.2 | 366 | 93 | 52 | 46 | 11 | 36 | 0 | 4 | 9 | 0 | 75 | |
| 2024 | ATL | AA | 1 | 4 | 4.02 | 8 | 8 | 0 | 0 | 0 | 0 | 0 | 40.1 | 166 | 38 | 21 | 18 | 3 | 14 | 0 | 0 | 0 | 1 | 36 | |
| 2024 | ATL | ST | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1.1 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | |
| 2025 | ATL | CPX | 0 | 0 | 5.68 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 6.1 | 26 | 7 | 4 | 4 | 0 | 2 | 0 | 0 | 0 | 0 | 8 | |
| 2025 | ATL | A+ | 0 | 1 | 7.11 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 6.1 | 29 | 5 | 5 | 5 | 1 | 7 | 0 | 0 | 1 | 0 | 7 | |
| 2025 | ATL | MiLB | 0 | 1 | 6.39 | 6 | 1 | 0 | 0 | 0 | 0 | 0 | 12.2 | 55 | 12 | 9 | 9 | 1 | 9 | 0 | 0 | 1 | 0 | 15 | |
| 2026 | Steamer | PROJ | 0 | 0 | 4.84 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 4 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | |||
| 2026 | OOPSY | PROJ | 0 | 0 | 5.50 | 1 | 1 | 0 | 0 | 0 | 3.3 | 14 | 3 | 2 | 2 | 0 | 2 | 0 | 0 | 2 |
| Season | Team | Level | W | L | ERA | G | GS | QS | CG | ShO | SV | HLD | BS | IP | TBF | H | R | ER | HR | BB | IBB | HBP | WP | BK | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | ATL | CPX | 2 | 0 | 2.76 | 10 | 0 | 0 | 0 | 0 | 0 | 0 | 16.1 | 79 | 18 | 16 | 5 | 0 | 9 | 0 | 0 | 3 | 1 | 23 | |
| 2022 | ATL | A | 7 | 1 | 2.09 | 15 | 8 | 0 | 0 | 0 | 0 | 0 | 73.1 | 285 | 58 | 19 | 17 | 6 | 17 | 0 | 1 | 4 | 1 | 77 | |
| 2022 | ATL | A+ | 3 | 2 | 4.88 | 9 | 9 | 0 | 0 | 0 | 0 | 0 | 48.0 | 202 | 52 | 28 | 26 | 5 | 16 | 0 | 1 | 5 | 0 | 37 | |
| 2022 | ATL | MiLB | 10 | 3 | 3.19 | 24 | 17 | 0 | 0 | 0 | 0 | 0 | 121.1 | 487 | 110 | 47 | 43 | 11 | 33 | 0 | 2 | 9 | 1 | 114 | |
| 2023 | ATL | A+ | 4 | 4 | 4.89 | 31 | 7 | 0 | 0 | 0 | 4 | 1 | 84.2 | 366 | 93 | 52 | 46 | 11 | 36 | 0 | 4 | 9 | 0 | 75 | |
| 2024 | ATL | AA | 1 | 4 | 4.02 | 8 | 8 | 0 | 0 | 0 | 0 | 0 | 40.1 | 166 | 38 | 21 | 18 | 3 | 14 | 0 | 0 | 0 | 1 | 36 | |
| 2024 | ATL | ST | 0 | 0 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1.1 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | |
| 2025 | ATL | CPX | 0 | 0 | 5.68 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 6.1 | 26 | 7 | 4 | 4 | 0 | 2 | 0 | 0 | 0 | 0 | 8 | |
| 2025 | ATL | A+ | 0 | 1 | 7.11 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 6.1 | 29 | 5 | 5 | 5 | 1 | 7 | 0 | 0 | 1 | 0 | 7 | |
| 2025 | ATL | MiLB | 0 | 1 | 6.39 | 6 | 1 | 0 | 0 | 0 | 0 | 0 | 12.2 | 55 | 12 | 9 | 9 | 1 | 9 | 0 | 0 | 1 | 0 | 15 | |
| 2026 | Steamer | PROJ | 0 | 0 | 4.84 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1.0 | 4 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | |||
| 2026 | OOPSY | PROJ | 0 | 0 | 5.50 | 1 | 1 | 0 | 0 | 0 | 3.3 | 14 | 3 | 2 | 2 | 0 | 2 | 0 | 0 | 2 |
Preseason ProjectionsMinor LeaguesSpring TrainingAverages
| Season | Team | Level | K/9 | BB/9 | K/BB | HR/9 | divider | K% | BB% | K-BB% | divider | AVG | WHIP | BABIP | LOB% | divider | ERA- | FIP- | divider | FIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | ATL | CPX | 12.67 | 4.96 | 2.56 | 0.00 | 29.1% | 11.4% | 17.7% | .257 | 1.65 | .383 | 40.7% | 58 | 64 | 2.99 | ||||
| 2022 | ATL | A | 9.45 | 2.09 | 4.53 | 0.74 | 27.0% | 6.0% | 21.1% | .217 | 1.02 | .283 | 84.3% | 48 | 80 | 3.55 | ||||
| 2022 | ATL | A+ | 6.94 | 3.00 | 2.31 | 0.94 | 18.3% | 7.9% | 10.4% | .281 | 1.42 | .329 | 66.1% | 118 | 109 | 4.53 | ||||
| 2022 | ATL | MiLB | 8.46 | 2.45 | 3.45 | 0.82 | 23.4% | 6.8% | 16.6% | .243 | 1.18 | .303 | 75.6% | 75 | 91 | 3.94 | ||||
| 2023 | ATL | A+ | 7.97 | 3.83 | 2.08 | 1.17 | 20.5% | 9.8% | 10.7% | .285 | 1.52 | .342 | 68.9% | 119 | 123 | 5.07 | ||||
| 2024 | ATL | AA | 8.03 | 3.12 | 2.57 | 0.67 | 21.7% | 8.4% | 13.3% | .250 | 1.29 | .310 | 64.9% | 119 | 104 | 3.53 | ||||
| 2024 | ATL | ST | 13.50 | 0.00 | 2.00 | 0.00 | 50.0% | 0.0% | 50.0% | .000 | 0.00 | .000 | 100.0% | 0 | 17 | 0.74 | ||||
| 2025 | ATL | CPX | 11.37 | 2.84 | 4.00 | 0.00 | 30.8% | 7.7% | 23.1% | .292 | 1.42 | .438 | 55.6% | 134 | 48 | 1.99 | ||||
| 2025 | ATL | A+ | 9.95 | 9.95 | 1.00 | 1.42 | 24.1% | 24.1% | 0.0% | .227 | 1.89 | .286 | 66.0% | 198 | 182 | 6.55 | ||||
| 2025 | ATL | MiLB | 10.66 | 6.39 | 1.67 | 0.71 | 27.3% | 16.4% | 10.9% | .261 | 1.66 | .367 | 61.2% | 166 | 115 | 4.27 | ||||
| 2026 | Steamer | PROJ | 6.79 | 3.74 | 1.81 | 1.29 | 17.1% | 9.4% | 7.6% | .269 | 1.48 | .301 | 70.6% | 4.85 | ||||||
| 2026 | OOPSY | PROJ | 5.56 | 4.17 | 1.33 | 1.34 | 14.3% | 10.8% | 3.6% | .271 | 1.49 | .291 | 64.3% | 5.38 |
| Season | Team | Level | K/9 | BB/9 | K/BB | HR/9 | divider | K% | BB% | K-BB% | divider | AVG | WHIP | BABIP | LOB% | divider | ERA- | FIP- | divider | FIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | ATL | CPX | 12.67 | 4.96 | 2.56 | 0.00 | 29.1% | 11.4% | 17.7% | .257 | 1.65 | .383 | 40.7% | 58 | 64 | 2.99 | ||||
| 2022 | ATL | A | 9.45 | 2.09 | 4.53 | 0.74 | 27.0% | 6.0% | 21.1% | .217 | 1.02 | .283 | 84.3% | 48 | 80 | 3.55 | ||||
| 2022 | ATL | A+ | 6.94 | 3.00 | 2.31 | 0.94 | 18.3% | 7.9% | 10.4% | .281 | 1.42 | .329 | 66.1% | 118 | 109 | 4.53 | ||||
| 2022 | ATL | MiLB | 8.46 | 2.45 | 3.45 | 0.82 | 23.4% | 6.8% | 16.6% | .243 | 1.18 | .303 | 75.6% | 75 | 91 | 3.94 | ||||
| 2023 | ATL | A+ | 7.97 | 3.83 | 2.08 | 1.17 | 20.5% | 9.8% | 10.7% | .285 | 1.52 | .342 | 68.9% | 119 | 123 | 5.07 | ||||
| 2024 | ATL | AA | 8.03 | 3.12 | 2.57 | 0.67 | 21.7% | 8.4% | 13.3% | .250 | 1.29 | .310 | 64.9% | 119 | 104 | 3.53 | ||||
| 2024 | ATL | ST | 13.50 | 0.00 | 2.00 | 0.00 | 50.0% | 0.0% | 50.0% | .000 | 0.00 | .000 | 100.0% | 0 | 17 | 0.74 | ||||
| 2025 | ATL | CPX | 11.37 | 2.84 | 4.00 | 0.00 | 30.8% | 7.7% | 23.1% | .292 | 1.42 | .438 | 55.6% | 134 | 48 | 1.99 | ||||
| 2025 | ATL | A+ | 9.95 | 9.95 | 1.00 | 1.42 | 24.1% | 24.1% | 0.0% | .227 | 1.89 | .286 | 66.0% | 198 | 182 | 6.55 | ||||
| 2025 | ATL | MiLB | 10.66 | 6.39 | 1.67 | 0.71 | 27.3% | 16.4% | 10.9% | .261 | 1.66 | .367 | 61.2% | 166 | 115 | 4.27 | ||||
| 2026 | Steamer | PROJ | 6.79 | 3.74 | 1.81 | 1.29 | 17.1% | 9.4% | 7.6% | .269 | 1.48 | .301 | 70.6% | 4.85 | ||||||
| 2026 | OOPSY | PROJ | 5.56 | 4.17 | 1.33 | 1.34 | 14.3% | 10.8% | 3.6% | .271 | 1.49 | .291 | 64.3% | 5.38 |

