Jack Flaherty

Active

Detroit Tigers · Pitcher

Age 306' 4" · 225 lbsThrows Right

FBaseball Overview

At 30 years old, Flaherty enters 2026 coming off a disappointing campaign that saw his ERA climb to 4.64 with a 1.28 WHIP across 161 innings, marking a significant decline from his All-MLB Second Team form in 2019. Early returns this season are even more concerning, as he carries a 4.97 ERA and 1.53 WHIP through just over 70 innings with a troubling 1-8 record, suggesting control issues and inconsistent run support compound his struggles. On the positive side, his strikeout rate remains respectable with 87 K in limited action, offering some appeal for managers seeking depth in the rotation, though wins and ERA are unlikely to provide meaningful fantasy value. The combination of elevated ERA, inflated WHIP, and poor win-loss record makes Flaherty a risky roster choice in 2026 unless performance metrics show marked improvement in the coming weeks.

MLB Pitching

Year	Team	G	GS	W	L	ERA	WHIP	K	IP	BB
2017	St. Louis Cardinals	6	5	0	2	6.33	1.55	20	21.1	10
2018	St. Louis Cardinals	28	28	8	9	3.34	1.11	182	151.0	59
2019	St. Louis Cardinals	33	33	11	8	2.75	0.97	231	196.1	55
2020	St. Louis Cardinals	9	9	4	3	4.91	1.21	49	40.1	16
2021	St. Louis Cardinals	17	15	9	2	3.22	1.06	85	78.1	26
2022	St. Louis Cardinals	9	8	2	1	4.25	1.61	33	36.0	22
2023	2 teams▼	29	27	8	9	4.99	1.58	148	144.1	66
2024	2 teams▼	28	28	13	7	3.17	1.07	194	162.0	38
2025	Detroit Tigers	31	31	8	15	4.64	1.28	188	161.0	59
2026	Detroit Tigers	17	17	2	8	4.60	1.45	92	76.1	37
Career	Totals	207	201	65	64	3.85	1.22	1222	1066.3	388

Source: MLB Stats API · Multi-team seasons show combined totals — click to expand

Minor League Pitching

Year	Team	G	GS	W	L	ERA	WHIP	K	IP	BB
2014	GCL Cardinals	8	6	1	1	1.59	0.97	28	22.2	4
2015	Peoria Chiefs	18	18	9	3	2.84	1.29	97	95.0	31
2016	Palm Beach Cardinals	24	23	5	9	3.56	1.30	126	134.0	45
2017	2 teams▼	25	25	14	4	2.18	1.04	147	148.2	35
2018	Memphis Redbirds	5	5	4	1	2.27	0.92	41	31.2	7
2021	2 teams▼	3	3	0	0	5.00	1.00	11	9	1
2022	2 teams▼	7	7	1	2	3.00	1.07	34	27	7
2026	Erie SeaWolves	1	1	1	0	3.18	0.71	7	5.2	1
Career	Totals	91	88	35	20	2.79	1.15	491	473.2	131

Source: MLB Stats API · Multi-team seasons show combined totals — click to expand

Game Log2026 season

Loading game log…

Pitching Analytics2026 season · via Baseball Savant

Click for year to year changes

FB Velo92.6 mph

Avg Spin2310 rpm

Whiff %26.5%

K %26.5%

BB %10.7%

Hard Hit %47.4%

Barrel %8.1%

xERA4.31

xBA Against0.238

xSLG Against0.389

BA Against0.248

SLG Against0.416

GB%32.5%

FB%30.2%

What These Stats Mean

FB Velo — Average fastball velocity. Harder throwers generate more swings and misses, setting up every other pitch in their arsenal. Velocity is the foundation of strikeout upside.

Avg Spin — Average spin rate across all pitches. Higher spin creates more movement and makes pitches harder to square up — elite spinners run better strikeout and batting average against numbers.

Whiff % — Swings-and-misses per swing. The most direct measure of a pitcher's ability to miss bats and the best leading indicator of strikeout rate.

K % — Strikeout rate per batter faced. The core fantasy pitching stat — high K% means reliable strikeout totals that hold up even in shorter starts.

BB % — Walk rate per batter faced. The primary control metric. High BB% tanks ERA and WHIP and keeps baserunners on constantly. Elite starters typically run below 7%.

Hard Hit % — Percentage of batted balls hit 95 mph or harder against. Low hard-hit% means weak contact, protecting both ERA and the defense behind the pitcher.

Barrel % — Percentage of batted balls barreled against. The most direct home run predictor — low barrel% pitchers rarely give up long balls.

xERA — Expected ERA based on contact quality allowed, removing the effect of sequencing, luck, and defense. Better predictor of future ERA than ERA itself.

xBA Against — Expected batting average opponents should hit based on contact quality. A gap between xBA and actual BA indicates unsustainable luck in either direction.

xSLG Against — Expected slugging allowed based on contact quality. High xSLG against predicts future extra-base damage; low xSLG means the pitcher is genuinely suppressing power.

BA Against — Actual batting average opponents are hitting — a key WHIP component. Check xBA to see if the number is sustainable.

SLG Against — Actual slugging allowed. Captures hits, doubles, triples, and home runs — lower means the pitcher is limiting the power damage he gives up.

GB% — Ground ball rate. High GB% pitchers generate double plays, limit home runs, and keep the ball in the park — great for protecting ERA and WHIP ratios.

FB% — Fly ball rate. High FB% pitchers give up more air contact — dangerous when combined with high exit velocity, less so when contact is soft.

Loading player data...

Year

Team

ERA

WHIP

2017

St. Louis Cardinals

6.33

1.55

21.1

2018

St. Louis Cardinals

3.34

1.11

182

151.0

2019

St. Louis Cardinals

2.75

0.97

231

196.1

2020

St. Louis Cardinals

4.91

1.21

40.1

2021

St. Louis Cardinals

3.22

1.06

78.1

2022

St. Louis Cardinals

4.25

1.61

36.0

2023

2 teams▼

4.99

1.58

148

144.1

2024

2 teams▼

3.17

1.07

194

162.0

2025

Detroit Tigers

4.64

1.28

188

161.0

2026

Detroit Tigers

4.60

1.45

76.1

Career

Totals

207

201

3.85

1.22

1222

1066.3

388

Year

Team

ERA

WHIP

2014

GCL Cardinals

1.59

0.97

22.2

2015

Peoria Chiefs

2.84

1.29

95.0

2016

Palm Beach Cardinals

3.56

1.30

126

134.0

2017

2 teams▼

2.18

1.04

147

148.2

2018

Memphis Redbirds

2.27

0.92

31.2

2021

2 teams▼

5.00

1.00

2022

2 teams▼

3.00

1.07

2026

Erie SeaWolves

3.18

0.71

5.2

Career

Totals

2.79

1.15

491

473.2

131