Jhonathan Díaz

2026 season

GP

1

W-L

0-0

ERA

6.77

WHIP

1.50

K

1

IP

1.1

Game log

Latest news

• The Mariners outrighted Diaz to Triple-A Tacoma on Monday.

  Diaz will stick around in the Mariners organization after going unclaimed on waivers when he was designated for assignment Saturday. The 29-year-old lefty's stay on the 40-man roster and 26-man active roster lasted just three days, with Diaz allowing one run on two hits and no walks over 1.1 innings in his lone relief appearance.

  RotoWire via ESPN · Aug 24

• The Mariners designated Diaz for assignment Saturday.

  Diaz gave up one run on two hits and struck out a batter in 1.1 innings during his lone appearance with the Mariners on Thursday. He'll now lose his spot on both the active and 40-man rosters to make room for the addition of top prospect Kade Anderson to Seattle's rotation. Diaz carries a 6.22 ERA through 111.1 innings at Triple-A Tacoma and is likely to remain there for the rest of the year if he clears waivers.

  RotoWire via ESPN · Aug 22

• The Mariners selected Diaz's contract from Triple-A Tacoma on Wednesday.

  Diaz has spent the entire 2026 season in Triple-A, where he's produced a 6.22 ERA, 1.55 WHIP and 83:42 K:BB over 111.1 innings. He's been used in both the rotation and bullpen in his limited time in the majors over the last five seasons, but the Mariners will likely plan for Diaz to provide some extra coverage in relief after Josh Simpson and Nick Davila both tossed 30-plus pitches during Tuesday's 22-0 loss to the Brewers. Simpson was optioned to clear room on the active roster for Diaz.

  RotoWire via ESPN · Aug 19

• Diaz was added to the Mariners' spring training roster as a non-roster invitee.

  Diaz was designated for assignment and outrighted to Triple-A in January, when the Mariners acquired Cooper Criswell. The left-hander will likely be a depth option for Seattle's bullpen this season, although he isn't guaranteed a spot on the Opening Day roster. He made just one big-league appearance in 2025.

  RotoWire via ESPN · Feb 11

• The Mariners outrighted Diaz to Triple-A Tacoma on Wednesday.

  Diaz was removed from the Mariners' 40-man roster last week but will remain in the organization after passing through waivers unclaimed. The left-hander has collected a 4.66 ERA and 33:27 K:BB over 46.1 frames covering parts of five seasons at the major-league level.

  RotoWire via ESPN · Jan 28

• The Mariners designated Diaz for assignment Friday, Adam Jude of The Seattle Times reports.

  With Cooper Criswell coming over from the Mets in a trade, Diaz will give up his place on the Mariners' 40-man roster. The 29-year-old southpaw made just one appearance with the Mariners near the start of the 2025 regular season, allowing one hit and striking out one batter over 1.1 innings. He spent the rest of the season at Triple-A Tacoma and turned in a 4.15 ERA and 1.32 WHIP across 138.2 frames.

  RotoWire via ESPN · Jan 23