Jack Flaherty played in Major League Baseball from 2017 to 2025, appearing in 190 games over 9 seasons. He recorded a total of 63 W and 56 L, an ERA of 3.8, 1,130 SO, a WHIP of 1.198, and a WAR of 13.7.
🧾 Basic Profile
 | |
| Name | Jack Flaherty |
| Date of Birth | October 15, 1995 |
| Nationality |  United States |
| Position | Pitcher |
| Throws | Right |
| Bats | Right |
| MLB Debut | 2017 |
Jack Flaherty Yearly Pitching Stats
This chart shows the season-by-season changes in ERA, SO, and IP for Jack Flaherty.
Parsing Data
Data Source: Baseball Reference
Image Source: Wikipedia
📊 Career Summary
Jack Flaherty appeared in 190 games over 9 MLB seasons from 2017 to 2025. Below are his cumulative stats and MLB all-time rankings:
| GS | 184 (MLB Rank: 868) |
| W | 63 (MLB Rank: 1,172) |
| L | 56 (MLB Rank: 1,370) |
| ERA | 3.8 (MLB Rank: 3,468) |
| IP | 990.2 (MLB Rank: 1,337) |
| SO | 1,130 (MLB Rank: 458) |
| BB | 351 (MLB Rank: 1,367) |
| H | 836 (MLB Rank: 1,598) |
| HR | 135 (MLB Rank: 641) |
| SO9 | 10.27 (MLB Rank: 458) |
| BB9 | 3.19 (MLB Rank: 7,895) |
| H9 | 7.59 (MLB Rank: 10,560) |
| HR9 | 1.23 (MLB Rank: 2,687) |
| WHIP | 1.198 (MLB Rank: 10,749) |
| WAR | 13.7 (MLB Rank: 933) |
📊 Last Season Summary (2025)
In his final season (2025), Jack Flaherty recorded the following stats:
| GS | 31 |
| W | 8 |
| L | 15 |
| ERA | 4.64 |
| IP | 161 |
| SO | 188 |
| BB | 59 |
| H | 147 |
| HR | 23 |
| SO9 | 10.51 |
| BB9 | 3.3 |
| H9 | 8.22 |
| HR9 | 1.29 |
| WHIP | 1.28 |
| WAR | 0.8 |
📈 Seasonal Highlights
- Most Wins: 2024, 13 W
- Most SO: 2019, 231 SO
- Most IP: 2019, 196.1 IP
- Best WAR: 2019, 5.7 WAR
- Best ERA: 2019, 2.75 ERA
🎯 Postseason Performance
Jack Flaherty appeared in 7 games during the postseason. He recorded an ERA of 3.55, pitched 33 IP, struck out 42 batters, with 1 W and 4 L.
Jack Flaherty Career Pitching Stats Overview
| season | W | L | ERA | W-L% | SV | SO | IP | WAR | WHIP | HR | H | BB | R | ER | ERA+ | FIP | SO9 | SO/BB | GS | G | GF | CG | SHO | HR9 | H9 | BB9 | BK | HBP | IBB | WP | BF |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2017 | 0 | 2 | 6.33 | 0 | 0 | 20 | 21.1 | -0.3 | 1.547 | 4 | 23 | 10 | 15 | 15 | 68 | 5.27 | 8.4 | 2 | 5 | 6 | 0 | 0 | 0 | 1.7 | 9.7 | 4.2 | 0 | 1 | 1 | 0 | 94 |
2018 | 8 | 9 | 3.34 | 0.471 | 0 | 182 | 151 | 3.2 | 1.106 | 20 | 108 | 59 | 59 | 56 | 116 | 3.86 | 10.8 | 3.08 | 28 | 28 | 0 | 0 | 0 | 1.2 | 6.4 | 3.5 | 0 | 11 | 3 | 6 | 615 |
2019 | 11 | 8 | 2.75 | 0.579 | 0 | 231 | 196.1 | 5.7 | 0.968 | 25 | 135 | 55 | 62 | 60 | 152 | 3.46 | 10.6 | 4.2 | 33 | 33 | 0 | 0 | 0 | 1.1 | 6.2 | 2.5 | 0 | 7 | 2 | 6 | 772 |
2020 | 4 | 3 | 4.91 | 0.571 | 0 | 49 | 40.1 | -0.3 | 1.215 | 6 | 33 | 16 | 22 | 22 | 86 | 4.11 | 10.9 | 3.06 | 9 | 9 | 0 | 0 | 0 | 1.3 | 7.4 | 3.6 | 0 | 3 | 0 | 1 | 170 |
2021 | 9 | 2 | 3.22 | 0.818 | 0 | 85 | 78.1 | 0.8 | 1.06 | 12 | 57 | 26 | 35 | 28 | 122 | 4.22 | 9.8 | 3.27 | 15 | 17 | 0 | 0 | 0 | 1.4 | 6.5 | 3 | 0 | 6 | 1 | 4 | 322 |
2022 | 2 | 1 | 4.25 | 0.667 | 0 | 33 | 36 | -0.1 | 1.611 | 4 | 36 | 22 | 18 | 17 | 93 | 4.97 | 8.3 | 1.5 | 8 | 9 | 0 | 0 | 0 | 1 | 9 | 5.5 | 0 | 5 | 0 | 0 | 167 |
2023 | 8 | 9 | 4.99 | 0.471 | 0 | 148 | 144.1 | 0.8 | 1.58 | 17 | 162 | 66 | 83 | 80 | 87 | 4.36 | 9.2 | 2.24 | 27 | 29 | 0 | 0 | 0 | 1.1 | 10.1 | 4.1 | 0 | 12 | 2 | 8 | 650 |
2024 | 13 | 7 | 3.17 | 0.65 | 0 | 194 | 162 | 3.1 | 1.068 | 24 | 135 | 38 | 61 | 57 | 127 | 3.47 | 10.8 | 5.11 | 28 | 28 | 0 | 0 | 0 | 1.3 | 7.5 | 2.1 | 0 | 4 | 0 | 6 | 649 |
2025 | 8 | 15 | 4.64 | 0.348 | 0 | 188 | 161 | 0.8 | 1.28 | 23 | 147 | 59 | 85 | 83 | 89 | 3.85 | 10.5 | 3.19 | 31 | 31 | 0 | 0 | 0 | 1.3 | 8.2 | 3.3 | 0 | 5 | 1 | 4 | 681 |
