John Klein

24-Year-Old PitcherRP
2026 Stats
W-L
0-0
ERA
0.00
WHIP
0.00
K
0
SV
0
Rest-of-Season Projections
W-L
ERA
WHIP
K
SV
Unlock Our Projections
2026 Fantasy Outlook
The undrafted free agent had a mini breakout season at Double-A Wichita last season and could be a late bloomer in his age 24 season. He had a 3.12 ERA and 95:24 K:BB ratio in 80.2 innings at Double-A, but struggled when called up to Triple-A with a 6.66 ERA and 33:13 K:BB in 25.2 innings. He was a bit unlucky at Triple-A with a .373 BABIP as he had a 3.30 FIP. Klein was used as a starter and reliever in the minors last season. He had a strong 10.8 K/9 overall in the minors which could make him a candidate for the major league bullpen at some point this summer. Read Past Outlooks
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League Majors
Bats R
Throws R
40 Man Yes
Height 6'5"
Weight 225
DOB 4/22/2002
Born Brooklyn Park, MN
College IOWA CENTRAL JC
Drafted 2022 MIN
Signed a one-year contract with the Twins in March of 2026.
Recalled from Triple-A
PMinnesota Twins
May 2, 2026
The Twins recalled Klein from Triple-A St. Paul on Saturday, Aaron Gleeman of The Athletic reports.
Analysis
Klein has made seven appearances (six starts) at St. Paul this season, posting a 7.48 ERA and 1.32 WHIP alongside a 24:6 K:BB through 21.2 innings. Although his numbers aren't exactly impressive, the Twins will call upon him to fill the open spot in their bullpen left by Cole Sands' (forearm) move to the injured list Saturday.
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Pitching Stats
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2026 MLB Game Log
2026
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Scoring
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Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
12
Last 10 Games
12
Last 5 Games
12
How many pitches does John Klein 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 John Klein generally pitch?
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
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8th
 
 
 
9th
 
Extra
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
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9th
 
Extra
% Games Reaching Innings Threshold
% Games By Number of Innings Pitched
Left/Right Pitching Splits
Since 2024
No Stats
2026
No Stats
2025
No Stats
2024
No Stats
BAA Batters K BB H 2B 3B HR
Since 2024vs Left .000 1 0 0 0 0 0 0
Since 2024vs Right .000 2 0 0 0 0 0 0
2026vs Left .000 1 0 0 0 0 0 0
2026vs Right .000 2 0 0 0 0 0 0
2025vs Left 0 0 0 0 0 0 0 0
2025vs Right 0 0 0 0 0 0 0 0
2024vs Left 0 0 0 0 0 0 0 0
2024vs Right 0 0 0 0 0 0 0 0
More Splits→ View More Split Stats
Home/Away Pitching Splits
Since 2024
No Stats
2026
No Stats
2025
No Stats
2024
No Stats
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2024Home 0.00 0.00 1.0 0 0 0 0.0 0.0 0.0
Since 2024Away 0 0 0 0 0 0 0 0 0
2026Home 0.00 0.00 1.0 0 0 0 0.0 0.0 0.0
2026Away 0 0 0 0 0 0 0 0 0
2025Home 0 0 0 0 0 0 0 0 0
2025Away 0 0 0 0 0 0 0 0 0
2024Home 0 0 0 0 0 0 0 0 0
2024Away 0 0 0 0 0 0 0 0 0
More Splits→ View More Split Stats
Stat Review
How does John Klein 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
0.00
 
K/9
0.0
 
BB/9
0.0
 
HR/9
0.0
 
Fastball
95.0 mph
 
ERA
0.00
 
WHIP
0.00
 
BABIP
.000
 
GB/FB
0.50
 
Left On Base
0.0%
 
Exit Velocity
73.4 mph
 
Barrels/BBE
0.0%
 
Spin Rate
2077 rpm
 
Balls Hit 95+ MPH
0.0%
 
Swinging Strike
0.0%
 
Prospect Rankings History
View Complete John Klein Prospect Ranking History
Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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More Fantasy News
Moves to Triple-A
PMinnesota Twins
March 9, 2026
The Twins optioned Klein to Triple-A St. Paul on Monday.
Analysis
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Working as starter
PMinnesota Twins
February 21, 2026
Klein will be built up as a starter this spring, Matthew Leach of MLB.com reports.
Analysis
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Protected from Rule 5 Draft
PMinnesota Twins
November 18, 2025
The Twins selected Klein's contract from Triple-A St. Paul on Tuesday.
Analysis
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