Jhonathan Diaz

Jhonathan Diaz

28-Year-Old PitcherRP
Seattle Mariners AAA
2025 Fantasy Outlook
There was no outlook written for Jhonathan Diaz in 2025. Check out the latest news below for more on his current fantasy value.
$Signed a one-year contract with the Mariners in January of 2024.
Sent to minors
PSeattle Mariners  AAA
September 23, 2024
The Mariners optioned Diaz to their spring training complex Monday.
ANALYSIS
The move makes room on the Mariners' 28-man active roster for right-handed reliever Gregory Santos (biceps), who was reinstated from the 15-day injured list. Diaz had made two appearances for the big club since being recalled Sept. 1, allowing one hit and one walk while striking out three over 3.1 scoreless innings.
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Pitching Stats
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2024
2023
2022
2021
2024 MLB Game Log
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2023 MLB Game Log
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2022 MLB Game Log
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Pitching Appearances Breakdown
Average Pitch Count
33
Last 10 Games
33
Last 5 Games
33
How many pitches does Jhonathan Diaz 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 Jhonathan Diaz 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 2022
 
 
-32%
BAA vs LHP
2024
 
 
-27%
BAA vs LHP
2023
 
 
-37%
BAA vs LHP
2022
 
 
-63%
BAA vs LHP
BAA Batters K BB H 2B 3B HR
Since 2022vs Left .231 45 8 5 9 2 1 0
Since 2022vs Right .341 110 15 15 31 9 1 3
2024vs Left .263 19 5 0 5 2 1 0
2024vs Right .360 28 3 3 9 1 0 2
2023vs Left .300 14 1 3 3 0 0 0
2023vs Right .476 28 3 4 10 5 0 0
2022vs Left .100 12 2 2 1 0 0 0
2022vs Right .267 54 9 8 12 3 1 1
More Splits View More Split Stats
Home/Away Pitching Splits
Since 2022
 
 
-76%
ERA on Road
2024
 
 
-100%
ERA on Road
2023
 
 
-94%
ERA on Road
2022
 
 
-49%
ERA on Road
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2022Home 7.79 2.42 17.1 1 1 0 5.7 6.2 1.0
Since 2022Away 1.84 1.23 14.2 0 1 0 7.4 4.9 0.6
2024Home 5.19 1.85 8.2 0 0 0 6.2 3.1 2.1
2024Away 0.00 1.00 1.0 0 1 0 18.0 0.0 0.0
2023Home 31.50 6.00 2.0 0 0 0 0.0 13.5 0.0
2023Away 1.80 1.60 5.0 0 0 0 7.2 7.2 0.0
2022Home 4.05 2.10 6.2 1 1 0 6.8 8.1 0.0
2022Away 2.08 1.04 8.2 0 0 0 6.2 4.2 1.0
More Splits View More Split Stats
Stat Review
How does Jhonathan Diaz 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
2.67
 
K/9
7.4
 
BB/9
2.8
 
HR/9
1.9
 
Fastball
89.5 mph
 
ERA
4.66
 
WHIP
1.76
 
BABIP
.384
 
GB/FB
1.25
 
Left On Base
77.5%
 
Exit Velocity
82.4 mph
 
Barrels/BBE
1.6%
 
Spin Rate
2235 rpm
 
Balls Hit 95+ MPH
21.0%
 
Swinging Strike
6.0%
 
Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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2023 Fantasy Outlook
Diaz spent most of 2022 in Triple-A, where he posted a 4.98 ERA, 1.36 WHIP and 46:20 K:BB over 47 innings. For a second straight season, he got a brief taste of the big-leagues, hurling 15.1 innings over four outings (three starts) and recording a 2.93 ERA. While that number looks good on the surface, Diaz gave up four walks in each of his first two appearances and logged a troubling 11:10 K:BB overall. Diaz doesn't throw hard -- he averaged 91.4 mph on his fastball last year during his time in the majors -- but he throws five different pitches, using all but his curveball at least 16% of the time last season. The slider was clearly his best pitch, as he threw it 44 times to big-league hitters during the campaign without giving up a hit while posting a 40.6% whiff rate on the offering. The southpaw ended the campaign on the 60-day IL with an undisclosed injury, and Los Angeles designated him for assignment in November before re-signing him to a minor-league contract the following month. He'll likely open the 2023 campaign back at Triple-A but should see some time in the majors at some point during the season.
More Fantasy News
Moves up from Triple-A
PSeattle Mariners  AAA
September 1, 2024
The Mariners recalled Diaz from Triple-A Tacoma prior to Sunday's 3-2 loss to the Angels.
ANALYSIS
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Dispatched to Tacoma
PSeattle Mariners  AAA
August 3, 2024
The Mariners optioned Diaz to Triple-A Tacoma on Saturday.
ANALYSIS
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Takes loss in extras
PSeattle Mariners  AAA
August 1, 2024
Diaz (0-1) took the extra-inning loss against the Red Sox on Wednesday, allowing an unearned run on one hit over one-third of an inning.
ANALYSIS
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Summoned from minors
PSeattle Mariners  AAA
July 30, 2024
The Mariners recalled Diaz from Triple-A Tacoma on Tuesday.
ANALYSIS
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Returns to Triple-A
PSeattle Mariners  AAA
July 2, 2024
The Mariners optioned Diaz to Triple-A Tacoma on Tuesday, Ryan Divish of The Seattle Times reports.
ANALYSIS
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