Jack Flaherty

Pitcher · Career Stats, Bio & Records (2017-2026)

Jack Flaherty is a pitcher who has played in Major League Baseball since 2017 for 4 teams, including the St. Louis Cardinals, a span of 10 seasons. Across 210 career appearances, he has gone 66-64 with a 3.85 ERA and 1,233 strikeouts. His career Pitcher PIV — Baseball Data Hub's era-adjusted measure of pitching impact — is 9191.0.

W (Wins):
Games credited to a pitcher whose team took a lead it never surrendered while he was the pitcher of record.
ERA (Earned Run Average):
Earned runs allowed per nine innings pitched: (ER × 9) ÷ IP. The primary measure of pitching effectiveness.
SO (Strikeouts):
For a batter, times retired on a third strike; for a pitcher, batters retired on a third strike.
WHIP (Walks and Hits per Inning Pitched):
Baserunners allowed per inning: (BB + H) ÷ IP. Under 1.00 is elite.

Data updated

Active Player
W–L 66–64
ERA 3.85
WHIP 1.21
SO 1,233
Pitcher PIV thru 2025 9191.0
Position
Pitcher
Bats / Throws
R / R
Height / Weight
6'4" / 225 lb
Born
10/15/1995 in Burbank, CA, USA
MLB Debut
2017-09-01

Full name: Jack Rafe Flaherty

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Career Pitching Statistics

Jack Flaherty — Career Pitching Statistics
W L G GS CG SHO SV IP H ER HR BB SO ERA Pitcher PIV
66 64 210 203 0 0 0 1079.0 917 462 146 393 1,233 3.85 9191.0

Career ERA 3.85 vs. league average 4.23 across their career seasons — 8.9% better than league average.

Season-by-Season Pitching

Pitching Career Arc

Click a stat to plot it across every season.

Jack Flaherty Stats, Bio & Career Records
Year Team Lg W L G GS CG SHO SV IP H ER BB SO ERA Lg ERA Pitcher PIV
2017 SLN NL 0 2 6 5 0 0 0 21.1 23 15 10 20 6.33 4.36 (-45%) -484.8
2018 SLN NL 8 9 28 28 0 0 0 151.0 108 56 59 182 3.34 4.15 (+20%) 1114.1
2019 SLN NL 11 8 33 33 0 0 0 196.1 135 60 55 231 2.75 4.51 (+39%) 5318.0
2020 SLN NL 4 3 9 9 0 0 0 40.1 33 22 16 49 4.91 4.45 (-10%) 350.2
2021 SLN NL 9 2 17 15 0 0 0 78.1 57 28 26 85 3.22 4.27 (+25%) 96.9
2022 SLN NL 2 1 9 8 0 0 0 36.0 36 17 22 33 4.25 3.97 (-7%) -904.7
2023 SLN NL 7 6 20 20 0 0 0 109.2 116 54 54 106 4.43 4.33 (-2%) 359.8
2023 BAL AL 1 3 9 7 0 0 0 34.2 46 26 12 42 6.75 4.33 (-56%) -441.9
2024 DET AL 7 5 18 18 0 0 0 106.2 83 35 19 133 2.95 4.08 (+28%) 2612.0
2024 LAN NL 6 2 10 10 0 0 0 55.1 52 22 19 61 3.58 4.08 (+12%) -114.0
2025 DET AL 8 15 31 31 0 0 0 161.0 147 83 59 188 4.64 4.16 (-12%) 1285.2
2026 DET AL 3 8 20 19 0 0 0 88.1 81 44 42 103 4.48 4.18 (-7%) -
Career · 12 seasons 66 64 210 203 0 0 0 1,079.0 917 462 393 1,233 3.85 — 9,191

Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.

Career Batting Statistics

Jack Flaherty — Career Batting Statistics
G AB R H 2B 3B HR RBI SB BB SO AVG OBP SLG OPS PIV
198 123 8 19 3 0 1 7 1 9 46 .154 .209 .203 .412 -375

Career AVG .154 vs. league average .247 across their career seasons — 37.5% below league average.

Career OBP .209 vs. league average .318 across their career seasons — 34.3% below league average.

Career SLG .203 vs. league average .412 across their career seasons — 50.7% below league average.

Career OPS .412 vs. league average .730 across their career seasons — 43.5% below league average.

Season-by-Season Batting

Career Arc

Click a stat to plot it across every season.

Jack Flaherty Stats, Bio & Career Records
Year Team Lg G AB R H 2B 3B HR RBI SB BB SO AVG Lg AVG Lg OBP Lg SLG Lg OPS PIV
2017 SLN NL 6 6 0 0 0 0 0 0 0 0 2 .000 — — — — 0.0
2018 SLN NL 31 46 2 7 0 0 0 0 0 2 20 .152 — — — — 0.0
2019 SLN NL 38 54 4 10 3 0 0 4 1 2 17 .185 .252 (-27%) .322 (-35%) .434 (-45%) .757 (-40%) -375.2
2020 SLN NL 9 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
2021 SLN NL 17 17 2 2 0 0 1 3 0 5 7 .118 — — — — 0.0
2022 SLN NL 9 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
2023 SLN NL 20 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
2023 BAL AL 9 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
2024 DET AL 18 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
2024 LAN NL 10 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
2025 DET AL 31 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
Career · 11 seasons 198 123 8 19 3 0 1 7 1 9 46 .154 — — — — -375

Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.

Postseason Statistics

Playoff Career Batting

Jack Flaherty — Playoff Career Batting
G AB R H 2B 3B HR RBI BB SO AVG
13 6 1 0 0 0 0 1 1 4 .000

Playoff Batting by Year

Jack Flaherty — Playoff Batting by Year
Year Round Team G AB R H 2B 3B HR RBI BB SO AVG
2025 ALDS2 DET 2 0 0 0 0 0 0 0 0 0 .000
2025 ALWC1 DET 1 0 0 0 0 0 0 0 0 0 .000
2024 NLCS LAN 2 0 0 0 0 0 0 0 0 0 .000
2024 NLDS2 LAN 1 0 0 0 0 0 0 0 0 0 .000
2024 WS LAN 2 0 0 0 0 0 0 0 0 0 .000
2023 ALDS1 BAL 1 0 0 0 0 0 0 0 0 0 .000
2020 NLWC2 SLN 1 0 0 0 0 0 0 0 0 0 .000
2019 NLCS SLN 1 1 0 0 0 0 0 0 0 1 .000
2019 NLDS2 SLN 2 5 1 0 0 0 0 1 1 3 .000

Playoff Career Pitching

Jack Flaherty — Playoff Career Pitching
W L G GS SV IP H ER BB SO ERA
2 6 13 11 0 57.0 56 32 26 58 5.05

Playoff Pitching by Year

Jack Flaherty — Playoff Pitching by Year
Year Round Team W L G GS SV IP H ER BB SO ERA
2025 ALDS2 DET 0 1 2 1 0 5.1 4 3 6 8 5.06
2025 ALWC1 DET 0 0 1 1 0 4.2 3 1 2 4 1.93
2024 NLCS LAN 1 1 2 2 0 10.0 10 8 6 6 7.20
2024 NLDS2 LAN 0 1 1 1 0 5.1 5 4 1 2 6.75
2024 WS LAN 0 0 2 2 0 6.2 9 6 2 7 8.10
2023 ALDS1 BAL 0 0 1 0 0 2.0 2 1 3 1 4.50
2020 NLWC2 SLN 0 1 1 1 0 6.0 6 1 2 8 1.50
2019 NLCS SLN 0 1 1 1 0 4.0 5 4 2 6 9.00
2019 NLDS2 SLN 1 1 2 2 0 13.0 12 4 2 16 2.77

Game Log & Splits

View full game log (388 games) →

Per-game data from Retrosheet (regular season, through 2025).

Batting — Home / Away

Jack Flaherty — Batting — Home / Away
SplitGABRHHRRBIAVG
Home935331215.226
Away105705702.100

Pitching — Home / Away

Jack Flaherty — Pitching — Home / Away
SplitGIPHERBBSOERA
Home90482.23801891515423.52
Away100508.04562292005884.06

Last 10 Games — Pitching

Jack Flaherty — Last 10 Games — Pitching
DateTmOppDecIPHRERBBSOHR
2025-09-24 DETCLE L 4.1533061
2025-09-17 DETCLE L 5.0311440
2025-09-10 DETNYY W 5.0200170
2025-09-05 DETCHW — 4.1644220
2025-08-30 DETKCR — 5.2411241
2025-08-24 DETKCR L 5.01088031
2025-08-18 DETHOU W 7.0300190
2025-08-12 DETCHW L 4.1855160
2025-08-06 DETMIN L 4.2865131
2025-08-01 DETPHI — 6.0211370

Fielding Statistics

Career Fielding Totals by Position

Jack Flaherty — Career Fielding Totals by Position
Position G GS PO A E DP
P 190 184 80 87 5 8

Season-by-Season Fielding

Jack Flaherty — Season-by-Season Fielding
Year Team Pos G GS PO A E DP
2017 SLN P 6 5 1 3 0 0
2018 SLN P 28 28 7 11 2 0
2019 SLN P 33 33 18 23 0 4
2020 SLN P 9 9 1 4 0 0
2021 SLN P 17 15 7 6 1 0
2022 SLN P 9 8 3 3 2 0
2023 SLN P 20 20 14 7 0 1
2023 BAL P 9 7 4 7 0 2
2024 DET P 18 18 6 6 0 0
2024 LAN P 10 10 4 3 0 0
2025 DET P 31 31 15 14 0 1

Career Games by Position

Position Diamond

Circle size = games played at each position.

Jack Flaherty Stats, Bio & Career Records
Position Games
Pitcher 190

Awards & Honors

Jack Flaherty — Awards & Honors
Year Award Notes
2019 All-MLB Team - Second Team SP
2019 Pitcher of the Month August
2019 Pitcher of the Month September

Award Voting History

Jack Flaherty — Award Voting History
Year Award League Finish Points Won Points Max Votes First
2019 Cy Young Award NL 4th 69.0 210 0
2019 Most Valuable Player NL 13th 9.0 420 0
2018 Rookie of the Year NL 5th 2.0 150 0

Most Similar Players

Career comps based on counting + rate stats and primary position. Score is relative — closest peer anchors at ~98%.

  1. 98
    James Paxton
    73-41, 3.77 ERA
  2. 97
    Zac Gallen
    69-61, 3.82 ERA
  3. 91
    Luis Severino
    75-61, 3.93 ERA
  4. 89
    Carlos Rodon
    100-75, 3.67 ERA
  5. 89
    Trevor Bauer
    83-69, 3.79 ERA
  6. 87
    Mike Clevinger
    60-44, 3.55 ERA

Jack Flaherty: the record in brief

Jack Flaherty made a major league debut on September 1, 2017 and is still active, so the totals on this page keep changing. Club by club, the record runs the St. Louis Cardinals (2017 through 2023), the Baltimore Orioles (2023), the Detroit Tigers (2024 to 2025), and the Los Angeles Dodgers (2024). At 6 feet, 4 inches and 225 pounds, Flaherty is listed as a pitcher. The bio says Flaherty batted and threw right-handed. The recorded birth is October 15, 1995, in Burbank, CA, USA. Flaherty's full given name, per the bio, is Jack Rafe Flaherty.

The pitching table credits Flaherty with a 66-64 record and a 3.85 ERA in 210 games. Flaherty has 1,233 strikeouts. That 3.85 ERA compares with a 4.23 league average across the same seasons, 8.9% better. 2019 brought Flaherty a season-high 11 wins. In 2019, one of the busiest seasons, Flaherty posted a 2.75 ERA; the league figure that year was 4.51.

Frequently Asked Questions about Jack Flaherty

What years did Jack Flaherty play?
Jack Flaherty played in Major League Baseball from 2017 to 2026.
Was Jack Flaherty a pitcher?
Yes. Jack Flaherty pitched in the major leagues, recording 66 wins and 1233 strikeouts.
How many home runs did Jack Flaherty hit?
Jack Flaherty hit 1 career home runs with 19 hits.
What was Jack Flaherty's career batting average?
Jack Flaherty batted .154 over his career, with 19 hits in 123 at bats.
How many RBI did Jack Flaherty have?
Jack Flaherty drove in 7 runs in his career.
What was Jack Flaherty's career ERA?
Jack Flaherty finished with a 3.85 career ERA, going 66-64 with 1,233 strikeouts.