2026 Stats
W-L
0-1
ERA
4.15
WHIP
1.62
K
2
SV
0
Rest-of-Season 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
Signed a one-year, $780,000 contract with the Twins in March of 2026.
Sent to Triple-A
The Twins optioned Klein to Triple-A St. Paul on Sunday.
Analysis
The right-hander was called up Saturday and will return to St. Paul after firing two scoreless frames against Pittsburgh. Across two stints in the majors this year, Klein has given up two earned runs with 2:4 K:BB in three appearances (4.1 innings).
The right-hander was called up Saturday and will return to St. Paul after firing two scoreless frames against Pittsburgh. Across two stints in the majors this year, Klein has given up two earned runs with 2:4 K:BB in three appearances (4.1 innings).
Pitching Stats
Loading Pitching Stats...
2026 MLB Game Log
2026
Minor League Game Log
Calculate Stats Over Time
Just click on any two dates.
Loading Minor League Pitching Game Log...
Pitching Appearances Breakdown
Average Pitch Count
27
Last 10 Games
27
Last 5 Games
27
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+
What part of the game does John Klein generally pitch?
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 2024
-50%
BAA vs RHP
2026
-50%
BAA vs RHP
| BAA | K | BB | H | HR | |
|---|---|---|---|---|---|
| Since 2024vs Left | .286 | 1 | 3 | 2 | 1 |
| Since 2024vs Right | .143 | 1 | 1 | 1 | 0 |
| 2026vs Left | .286 | 1 | 3 | 2 | 1 |
| 2026vs Right | .143 | 1 | 1 | 1 | 0 |
| 2025vs Left | 0 | 0 | 0 | 0 | 0 |
| 2025vs Right | 0 | 0 | 0 | 0 | 0 |
| 2024vs Left | 0 | 0 | 0 | 0 | 0 |
| 2024vs Right | 0 | 0 | 0 | 0 | 0 |
Home/Away Pitching Splits
Since 2024
-100%
ERA at Home
2026
-100%
ERA at Home
| ERA | WHIP | IP | K/9 | BB/9 | |
|---|---|---|---|---|---|
| Since 2024Home | 0.00 | 0.00 | 1.0 | 0.0 | 0.0 |
| Since 2024Away | 5.40 | 2.10 | 3.1 | 5.4 | 10.8 |
| 2026Home | 0.00 | 0.00 | 1.0 | 0.0 | 0.0 |
| 2026Away | 5.40 | 2.10 | 3.1 | 5.4 | 10.8 |
| 2025Home | 0 | 0 | 0 | 0 | 0 |
| 2025Away | 0 | 0 | 0 | 0 | 0 |
| 2024Home | 0 | 0 | 0 | 0 | 0 |
| 2024Away | 0 | 0 | 0 | 0 | 0 |
Minor League Left/Right Pitching Splits (AAA)
Since 2024
-10%
BAA vs LHP
2026
-16%
BAA vs LHP
| BAA | K | BB | H | HR | |
|---|---|---|---|---|---|
| Since 2024vs Left | .233 | 39 | 19 | 31 | 6 |
| Since 2024vs Right | .259 | 38 | 11 | 29 | 6 |
| 2026vs Left | .217 | 24 | 9 | 18 | 5 |
| 2026vs Right | .258 | 20 | 8 | 16 | 6 |
| 2025vs Left | .260 | 15 | 10 | 13 | 1 |
| 2025vs Right | .260 | 18 | 3 | 13 | 0 |
| 2024vs Left | 0 | 0 | 0 | 0 | 0 |
| 2024vs Right | 0 | 0 | 0 | 0 | 0 |
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.
* 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
0.50K/9
4.2BB/9
8.3HR/9
2.1Fastball
94.9 mphERA
4.15WHIP
1.62BABIP
.164GB/FB
0.57Left On Base
89.3%Exit Velocity
79.6 mphBarrels/BBE
2.9%Spin Rate
2131 rpmBalls Hit 95+ MPH
20.6%Swinging Strike
3.7%Prospect Rankings History
Our full prospect rankings are reserved for RotoWire subscribers.
Subscribe Now
Advanced Pitching Stats
Loading Advanced Pitching Stats...
Defensive Stats
Loading MLB Defensive Stats...
Stats Vs Today's Lineup
Want more matchup stats?
Loading Matchup Stats...
Our full team depth charts are reserved for RotoWire subscribers.
Subscribe Now
More Fantasy News
Back in majors
The Twins recalled Klein from Triple-A St. Paul on Saturday.
Analysis
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.
Returning to Triple-A
The Twins optioned Klein to Triple-A St. Paul on Thursday, Betsy Helfand of the St. Paul Pioneer Press reports.
Analysis
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.
Recalled from Triple-A
The Twins recalled Klein from Triple-A St. Paul on Saturday, Aaron Gleeman of The Athletic reports.
Analysis
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.
Moves to Triple-A
The Twins optioned Klein to Triple-A St. Paul on Monday.
Analysis
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.
Working as starter
Klein will be built up as a starter this spring, Matthew Leach of MLB.com reports.
Analysis
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.