Griffin Jax

Griffin Jax

30-Year-Old PitcherRP
Minnesota Twins
2025 Fantasy Outlook
Jax broke out as a lockdown reliever in 2024, posting career-best marks across multiple categories including a 2.03 ERA, 0.87 WHIP, 95 strikeouts, 10 saves and 24 holds. The 29-year-old significantly improved his strikeout rate (34.4 percent) by nearly 10 percentage points - his sweeper and changeup headlining his five-pitch aresenal with 45 percent or better whiff rates. Jax's 37.8 percent overall whiff rate was a 98th percentile metric. The Twins recently indicated they're open to the possibility of moving Jax to the starting rotation. The right-hander came up through the minors as a starter and made 14 starts for the Twins in 2021, posting a 6.10 ERA. Given his past starting experience, Jax would seem more equipped for a shift to the rotation than most relievers. The question is whether the uptick in stuff since his move to relief would translate back to a starting role. Read Past Outlooks
RANKS
Rest of Season From Preseason
#315
ADP
$Signed a one-year, $2.37 million contract with the Twins in January of 2025.
Early struggles continue
PMinnesota Twins
April 18, 2025
Jax (0-2) took the loss in Friday's 6-4 loss to Atlanta. He allowed four runs on two hits and two walks while striking out one over one-third of an inning.
ANALYSIS
Jax began the eighth inning with a three-run lead but couldn't hit his spots and wasn't helped by a shaky defense. It's his second poor outing in a row that has cost the Twins a lead. He has an ugly 11.25 ERA and 2.13 WHIP so far this season. He does have a strong 12:3 K:BB in eight innings with an unsustainable .480 BABIP, so there's plenty of reasons to believe he'll turn his season around. Still, he may see usage in lower-leverage spots the next few games to get him back on track.
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Pitching Stats
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2025
2024
2023
2022
2021
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2024 MLB Game Log
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2023 MLB Game Log
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Pitching Appearances Breakdown
Average Pitch Count
17
Last 10 Games
17
Last 5 Games
17
How many pitches does Griffin Jax generally throw?
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
What part of the game does Griffin Jax generally pitch?
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
% Games Reaching Innings Threshold
% Games By Number of Innings Pitched
Left/Right Pitching Splits
Since 2023
 
 
-10%
BAA vs RHP
2025
 
 
-13%
BAA vs RHP
2024
 
 
-16%
BAA vs RHP
2023
 
 
-4%
BAA vs RHP
BAA Batters K BB H 2B 3B HR
Since 2023vs Left .230 271 82 19 57 11 3 5
Since 2023vs Right .207 328 97 18 63 9 2 6
2025vs Left .348 23 7 0 8 1 0 1
2025vs Right .304 26 9 3 7 3 0 1
2024vs Left .200 131 40 8 24 5 1 2
2024vs Right .169 145 55 7 23 2 2 2
2023vs Left .238 117 35 11 25 5 2 2
2023vs Right .228 157 33 8 33 4 0 3
More Splits View More Split Stats
Home/Away Pitching Splits
Since 2023
 
 
-25%
ERA on Road
2025
 
 
-33%
ERA at Home
2024
 
 
-29%
ERA at Home
2023
 
 
-58%
ERA on Road
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2023Home 3.77 1.03 76.1 6 9 7 12.0 2.2 0.7
Since 2023Away 2.83 1.11 70.0 5 8 7 9.9 2.3 0.6
2025Home 7.50 1.50 6.0 0 0 0 18.0 0.0 1.5
2025Away 11.25 2.25 4.0 0 2 0 9.0 6.8 2.3
2024Home 1.70 0.78 37.0 3 2 4 12.2 1.5 0.2
2024Away 2.38 0.97 34.0 2 3 6 11.9 2.4 0.8
2023Home 5.40 1.23 33.1 3 7 3 10.8 3.5 1.1
2023Away 2.25 1.13 32.0 3 3 1 7.9 1.7 0.3
More Splits View More Split Stats
Stat Review
How does Griffin Jax compare to other relievers?
This section compares his stats with all relief pitcher seasons from the previous three seasons (minimum 30 innings)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.

* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
  • K/BB
    Strikeout to walk ratio.
  • K/9
    Average strikeouts per nine innings.
  • BB/9
    Average walks per nine innings.
  • HR/9
    Average home runs allowed per nine innings.
  • Fastball
    Average fastball velocity.
  • ERA
    Earned run average. The average earned runs allowed per nine innings.
  • WHIP
    Walks plus hits per inning pitched.
  • BABIP
    Batting average on balls in play. Measures how many balls in play against a pitcher go for hits.
  • GB/FB
    Groundball to flyball ratio. The higher the number, the more likely a pitcher is to induce groundballs.
  • Left On Base
    The percentage of base runners that a pitcher strands on base over the course of a season.
  • Exit Velocity
    The speed of the baseball as it comes off the bat, immediately after a batter makes contact.
  • Barrels/BBE
    The percentage of batted ball events resulting in a Barrel. A Barrel is a batted ball with similar exit velocity and launch angle to past ones that led to a minimum .500 batting average and 1.500 slugging percentage.
  • Spin Rate
    Spin Rate is the rate of spin on a baseball after it is released. It is measured in revolutions per minute (rpm).
  • Balls Hit 95+ MPH
    The percentage of batted balls hit that met or exceeded the 95 MPH threshold.
  • Swinging Strike
    The percentage of pitches that result in a swing and a miss.
K/BB
4.67
 
K/9
14.0
 
BB/9
3.0
 
HR/9
2.0
 
Fastball
97.0 mph
 
ERA
10.00
 
WHIP
2.00
 
BABIP
.533
 
GB/FB
1.38
 
Left On Base
46.1%
 
Exit Velocity
79.7 mph
 
Barrels/BBE
7.1%
 
Spin Rate
2487 rpm
 
Balls Hit 95+ MPH
32.1%
 
Swinging Strike
18.4%
 
Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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Past Fantasy Outlooks
2024
2023
2022
2021
Jax led Twins relievers with 71 appearances and 23 holds last season as the team's primary setup man. The 29-year-old racked up 10 losses to lead all relievers, but his ratios and underlying metrics were solid. Jax's 3.3 barrel percentage allowed was in the 97th percentile, while his hard-hit percentage, average exit velocity and 56.8 percent ground ball rate were all well above-average. His 2.86 xERA was a full point better than his 3.86 ERA, which shows there's room for improvement in that category. Expect Jax to rack up 20-plus holds and a handful of ancillary saves again in 2024.
After making 14 starts during his rookie 2021 season, Jax transitioned to full-time relief last year. He didn't make the Twins' Opening Day roster, but was recalled a few days after the season started and quickly settled into his new multi-inning role out of the bullpen. Increased velocity (+2.8 mph on average) and a pitch mix adjustment followed the role change, as Jax's slider (48% usage) replaced his 4-seamer (34%) as his primary offering. The 28-year-old improved both his strikeout (26.9%) and walk (6.9%) rates with a 78:20 K:BB ratio over 72.1 innings. He also induced grounders at a 47.3% rate to create a profile that should be on deeper mixed league radars regardless of role. Jax quickly ascended Minnesota's leverage ladder and became one of their primary setup men, tying for the team lead with 18 holds. Expect plenty of volume - Jax was 11th among qualified relievers with 72.1 innings - along with decent ratios and potentially even saves in 2023.
Jax put together an up-and-down rookie campaign with a 6.37 ERA, 1.35 WHIP and 65:29 K:BB across 82 innings. After starting 14 games in 2021, he'll move to the bullpen and try to win a middle relief role. Moving forward, he'll need to do a better job of keeping the ball in the park to find sustained success, as his 2.52 HR/9 in 2021 ranked third-highest among pitchers who threw at least 50 innings. He's had good control in the minors and success despite mediocre strikeout rates. He could be a late bloomer at age 27, as he threw just 40 minor league games from 2016 to 2019 as his ability to play minor league baseball was severely limited by Air Force obligations.
Jax, a 2016 third-round draft pick, pitched in just 40 minor league games from 2016 to 2019 as his ability to play minor league baseball was severely limited by Air Force obligations. While he's a bit old for a prospect (26 this season), he's shown promise at higher levels with a 2.67 ERA and 1.94 BB/9 at Double-A in 2019. He hasn't had great strikeout rates (6.7 K/9 in 2019), However. Still, he's still a bit of an unknown given his sparse minor league career. Minnesota should get a better picture with a full season in 2020. He could add rotation depth at Triple-A if all goes well.
More Fantasy News
Collapses in ninth inning
PMinnesota Twins
April 6, 2025
Jax pitched one inning, surrendering two runs on three hits while striking out three batters on his way to a blown save in Sunday's 9-7 extra-inning loss to the Astros. He did not factor into the decision.
ANALYSIS
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Not sharp in regular-season debut
PMinnesota Twins
March 27, 2025
Jax allowed a run on a home run and a walk while striking out one over two-thirds of an inning Thursday against the Cardinals.
ANALYSIS
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Strikes deal for 2025
PMinnesota Twins
January 9, 2025
Jax and the Twins avoided arbitration Thursday by agreeing to a one-year, $2.365 million contract, Mark Feinsand of MLB.com reports.
ANALYSIS
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Will remain in bullpen
PMinnesota Twins
January 8, 2025
Jax will remain in the Twins' bullpen rather than move into the rotation, general manager Jeremy Zoll confirmed Wednesday, Bobby Nightengale of the Minneapolis Star Tribune reports.
ANALYSIS
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Move to rotation not ruled out
PMinnesota Twins
November 13, 2024
Twins bench coach Jayce Tingler indicated in a recent interview that the team is open to the possibility of moving Jax into the rotation, Mike Ferrin of MLB Network Radio reports.
ANALYSIS
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Latest Fantasy Rumors
Comfortable in relief role
PMinnesota Twins
January 26, 2025
According to Dan Hayes of The Athletic, Jax indicated he's glad to continue serving as a reliever after considering a return to the starting rotation.
ANALYSIS
Twins GM Jeremy Zoll said in early January that Jax would be remaining in the bullpen after the coaching staff indicated early in the offseason that a role change was being considered, and it appears the right-hander agrees with the decision to stick in relief. Jax was tantalized by the higher earning potential for starting pitchers but admitted he's likely better suited to work as a high-leverage reliever. The 30-year-old had a 2.03 ERA and 95:15 K:BB with 10 saves and 24 holds over 72 appearances last season.
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