Griffin Jax

Active

Tampa Bay Rays · Pitcher

Age 316' 2" · 195 lbsThrows Right

FBaseball Overview

At 31 years old, Jax operates as a depth starter for the Rays with mixed results through the first month of 2026, posting a 3-5 record despite a respectable 3.33 ERA and 1.31 WHIP across 54 innings. His strikeout rate remains solid with 53 K in limited action, though he has surrendered wins at an alarming pace, making him an inconsistent source of victories for fantasy rosters. The lack of save opportunities limits his utility in league formats, positioning him as a streaming option rather than a weekly anchor. Managers should monitor his workload and ERA trends closely, as his volatility between 2025 (4.23 ERA) and 2026 (3.33 ERA) suggests reliability issues that could impact lineups in a 31-year-old arm in a competitive divisional rotation.

MLB Pitching

Year	Team	G	GS	W	L	SV	ERA	WHIP	K	IP	BB
2021	Minnesota Twins	18	14	4	5	0	6.37	1.35	65	82.0	29
2022	Minnesota Twins	65	0	7	4	1	3.36	1.05	78	72.1	20
2023	Minnesota Twins	71	0	6	10	4	3.86	1.18	68	65.1	19
2024	Minnesota Twins	72	0	5	5	10	2.03	0.87	95	71.0	15
2025	2 teams▼	73	2	1	7	0	4.23	1.29	99	66.0	21
2026	Tampa Bay Rays	24	13	4	6	0	3.60	1.22	68	65.0	22
Career	Totals	323	29	27	37	15	3.97	1.16	473	421.2	126

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
2016	Elizabethton Twins	4	0	0	1	4.15	1.85	8	8.2	1
2017	2 teams▼	5	5	2	2	2.61	1.03	20	31	7
2018	Fort Myers Miracle	15	14	3	4	3.70	1.23	66	87.2	15
2019	2 teams▼	23	23	5	7	2.90	1.13	94	127.1	27
2021	St. Paul Saints	8	8	4	1	3.76	1.30	36	40.2	16
2022	St. Paul Saints	1	0	1	0	0.00	0.50	2	2.0	1
Career	Totals	56	50	15	15	3.24	1.19	226	297.1	67

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

Game Log2026 season

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Pitching Analytics2026 season · via Baseball Savant

Click for year to year changes

FB Velo95.9 mph

Avg Spin2551 rpm

Whiff %31.5%

K %25.6%

BB %8.3%

Hard Hit %41.7%

Barrel %10.9%

xERA5.10

xBA Against0.268

xSLG Against0.471

BA Against0.239

SLG Against0.420

GB%46.3%

FB%23.4%

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.

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Year

Team

ERA

WHIP

2021

Minnesota Twins

6.37

1.35

82.0

2022

Minnesota Twins

3.36

1.05

72.1

2023

Minnesota Twins

3.86

1.18

65.1

2024

Minnesota Twins

2.03

0.87

71.0

2025

2 teams▼

4.23

1.29

66.0

2026

Tampa Bay Rays

3.60

1.22

65.0

Career

Totals

323

3.97

1.16

473

421.2

126

Year

Team

ERA

WHIP

2016

Elizabethton Twins

4.15

1.85

8.2

2017

2 teams▼

2.61

1.03

2018

Fort Myers Miracle

3.70

1.23

87.2

2019

2 teams▼

2.90

1.13

127.1

2021

St. Paul Saints

3.76

1.30

40.2

2022

St. Paul Saints

0.00

0.50

2.0

Career

Totals

3.24

1.19

226

297.1