2025 Stats
W-L
0-0
ERA
0.00
WHIP
0.00
K
0
SV
0
Rest-of-Season Projections

Heading to minor-league camp
The Mariners reassigned Diaz to minor-league camp Monday.
ANALYSIS
Diaz has been getting stretched out as a starter during spring training, but he wasn't in contention for a spot in Seattle's Opening Day rotation, even with the Mariners set to begin the campaign without George Kirby (shoulder). Emerson Hancock is expected to get the first crack at replacing Kirby, but Diaz could be among the next pitchers in line to make spot starts if the Mariners lose another rotation member to an injury. Diaz will continue to make regular turns through the rotation at Triple-A Tacoma until he might be needed by the big club.
Diaz has been getting stretched out as a starter during spring training, but he wasn't in contention for a spot in Seattle's Opening Day rotation, even with the Mariners set to begin the campaign without George Kirby (shoulder). Emerson Hancock is expected to get the first crack at replacing Kirby, but Diaz could be among the next pitchers in line to make spot starts if the Mariners lose another rotation member to an injury. Diaz will continue to make regular turns through the rotation at Triple-A Tacoma until he might be needed by the big club.
Pitching Stats
Loading Pitching Stats...
2024
2023
2022
2021
Minor League Game Log

Calculate Stats Over Time
Just click on any two dates.
Loading Minor League Pitching Game Log...
Left/Right Pitching Splits
Since 2023
-33%
BAA vs LHP
2025
No Stats
BAA | K | BB | H | HR | ||||
---|---|---|---|---|---|---|---|---|
Since 2023vs Left | .276 | 6 | 3 | 8 | 0 | |||
Since 2023vs Right | .413 | 6 | 7 | 19 | 2 | |||
2025vs Left | 0 | 0 | 0 | 0 | 0 | |||
2025vs Right | 0 | 0 | 0 | 0 | 0 | |||
2024vs Left | .263 | 5 | 0 | 5 | 0 | |||
2024vs Right | .360 | 3 | 3 | 9 | 2 | |||
2023vs Left | .300 | 1 | 3 | 3 | 0 | |||
2023vs Right | .476 | 3 | 4 | 10 | 0 | |||
More Splits→ | View More Split Stats |
Home/Away Pitching Splits
Since 2023
-85%
ERA on Road
2025
No Stats
ERA | WHIP | IP | K/9 | BB/9 | |||||
---|---|---|---|---|---|---|---|---|---|
Since 2023Home | 10.13 | 2.63 | 10.2 | 5.1 | 5.1 | ||||
Since 2023Away | 1.50 | 1.50 | 6.0 | 9.0 | 6.0 | ||||
2025Home | 0 | 0 | 0 | 0 | 0 | ||||
2025Away | 0 | 0 | 0 | 0 | 0 | ||||
2024Home | 5.19 | 1.85 | 8.2 | 6.2 | 3.1 | ||||
2024Away | 0.00 | 1.00 | 1.0 | 18.0 | 0.0 | ||||
2023Home | 31.50 | 6.00 | 2.0 | 0.0 | 13.5 | ||||
2023Away | 1.80 | 1.60 | 5.0 | 7.2 | 7.2 | ||||
More Splits→ | View More Split Stats |
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
Recent RotoWire Articles Featuring Jhonathan Diaz See More

Todd Zola tries to remove volume from the equation when determining the value of pitchers, and finds that the market may have over-corrected on Logan Webb.

Erik Siegrist checks out the free-agent pool in the American League and notes that Heston Kjerstad is only one of the rookie sluggers likely to draw significant bids this week.
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

Joins camp as NRI
Diaz agreed Wednesday with the Mariners on a minor-league contract that includes an invitation to spring training, Ryan Divish of The Seattle Times reports.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.

Enters open market
Diaz cleared waivers Friday and elected to become a free agent.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.

Removed from 40-man roster
The Mariners designated Diaz for assignment Monday.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.

Sent to minors
The Mariners optioned Diaz to their spring training complex Monday.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.

Moves up from Triple-A
The Mariners recalled Diaz from Triple-A Tacoma prior to Sunday's 3-2 loss to the Angels.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.