Jhonathan Díaz - MLB News, Rumors, & Updates

Invited to Spring Training Diaz was added to the Mariners' Spring Training roster as a non-roster invitee.

Impact 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 in Seattle's bullpen this season. He made just one big-league appearance in 2025.

FEBRUARY 11 • ROTOWIRE

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

Impact 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.

JANUARY 28 • ROTOWIRE

Mariners acquire right-hander Cooper Criswell from Mets for cash

The Seattle Mariners acquired right-hander Cooper Criswell from the New York Mets on Friday for cash, and designated left-hander Jhonathan Diaz for assignment

JANUARY 24 • Associated Press

Booted from 40-man roster The Mariners designated Diaz for assignment Friday, Adam Jude of The Seattle Times reports.

Impact 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, during which he gave up one hit and struck 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.

JANUARY 23 • ROTOWIRE

Seattle Mariners Option Left-Handed Reliever Jhonathan Diaz to Triple-A The Seattle Mariners made roster moves in anticipation of a rare bullpen today before a schedule game against the Chicago White Sox on Tuesd...

MAY 21, 2025 • SI.COM

Mariners use sharp pitching and timely hitting to deliver strong road start

When it comes to life on the road, the Seattle Mariners are making themselves right at home

MAY 21, 2025 • Associated Press

Optioned to Tacoma The Mariners optioned Diaz to Triple-A Tacoma on Tuesday.

Impact Diaz didn't appear in a game after being recalled from the minors last week, and he'll now be sent back down in favor of Casey Lawrence. The 28-year-old Diaz has turned in a 5.87 ERA and 1.49 WHIP across 30.2 innings at Tacoma.

MAY 20, 2025 • ROTOWIRE

Mariners right-hander Bryce Miller placed on 15-day injured list with right elbow inflammation

Seattle Mariners right-hander Bryce Miller was placed on the 15-day injured list with right elbow inflammation ahead of Wednesday afternoon’s game against the New York Yankees

MAY 14, 2025 • Associated Press

Rejoins big club The Mariners recalled Diaz from Triple-A Tacoma on Wednesday.

Impact Diaz will link up with the big club for the second time this season, after he previously made a 1.1-inning relief appearance April 1 against the Tigers before being demoted a day later. Since then, Diaz has been getting stretched out a starter at Tacoma and had produced a 5.87 ERA, 1.49 WHIP and 27:10 K:BB over 30.2 innings. Diaz could be available in relief for Wednesday's game against the Yankees, but if he ends up going unused, he might be an option to make a spot start this weekend in San Diego. The Mariners have an opening in the rotation after Bryce Miller (elbow) was placed on the 15-day injured list in a corresponding move.

MAY 14, 2025 • ROTOWIRE

Optioned to Triple-A The Mariners optioned Diaz to Triple-A Tacoma on Wednesday.

Impact Diaz made his one appearance for Seattle on Tuesday. He allowed no runs on one hit with a strikeout in 1.1 innings. The southpaw has made the bulk of his appearances for Tacoma as a starter and figured to get a shot at securing a rotation spot in place of the injured George Kirby (shoulder). After just one relief appearance, he will return to Tacoma. A corresponding move is yet to be revealed.

APRIL 3, 2025 • ROTOWIRE

Selected from Triple-A The Mariners selected Diaz from Triple-A Tacoma on Tuesday.

Impact Diaz's selection now makes Seattle's roster full at 40 players. He was beat out by Emerson Hancock in spring training for a role in the starting rotation. Now with Hancock being optioned to Triple-A Tacoma in a corresponding move Tuesday, Diaz has a chance to secure the spot.

APRIL 1, 2025 • ROTOWIRE

Heading to minor-league camp The Mariners reassigned Diaz to minor-league camp Monday.

Impact 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.

MARCH 10, 2025 • ROTOWIRE

Joins camp as NRI Diaz agreed Wednesday with the Mariners on a minor-league contract, Ryan Divish of The Seattle Times reports.

Impact Seattle removed Diaz from its 40-man roster earlier this month, and after he elected free agency upon clearing waivers, the 28-year-old will now rejoin the Mariners for the start of spring training. He'll be attending big-league camp as a non-roster invitee and will presumably get the opportunity to compete for a spot in the Opening Day bullpen as a long reliever. The Mariners boast a talented rotation that has all five members healthy heading into spring training, but Diaz's prior big-league starting experience could put him high on the list for spot starts if injuries in the rotation stack up at any point. He made five appearances (one start) for Seattle in 2024, covering 9.2 innings and allowing five earned runs on 14 hits and three walks while striking out eight.

FEBRUARY 12, 2025 • ROTOWIRE

Enters open market Diaz cleared waivers Friday and elected to become a free agent.

Impact Diaz ended up as the Mariners' roster casualty following the acquisition of Casey Legumina. After going unclaimed off waivers, Diaz will now exercise his right to leave the organization and explore his other options. The 28-year-old righty owns a 4.80 ERA and 1.73 WHIP across 45 career MLB innings.

FEBRUARY 7, 2025 • ROTOWIRE

Removed from 40-man roster The Mariners designated Diaz for assignment Monday.

Impact The transaction clears a spot on the 40-man roster for the addition of Casey Legumina. Diaz, 28, has been unimpressive over parts of four big-league seasons, compiling a 4.80 ERA and 32:27 K:BB across 45 innings. He should stand a good chance of passing through waivers unclaimed.

FEBRUARY 3, 2025 • ROTOWIRE

Optioned by Seattle The Mariners optioned Diaz to the Spring Training Complex on Monday.

Impact The move makes room on the Mariners' roster for right-handed reliever Gregory Santos (biceps), who was reinstated from the 15-day injured list. Diaz has 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.

SEPTEMBER 23, 2024 • ROTOWIRE

Moves up from Triple-A The Mariners recalled Diaz from Triple-A Tacoma prior to Sunday's 3-2 loss to the Angels.

Impact Diaz had started in all but one of his 24 appearances for Tacoma this season, logging a 4.73 ERA and 120:54 K:BB in 118 innings. With all five of the Mariners' starting pitchers healthy at the moment and new manager Dan Wilson having yet to express a desire to move to a six-man rotation, Diaz looks like he'll serve as a long-relief option for now.

SEPTEMBER 1, 2024 • ROTOWIRE

Optioned to Tacoma The Mariners optioned Diaz to Triple-A Tacoma on Saturday.

Impact Diaz has given up two earned runs in one-plus innings over his two appearances since being promoted from Triple-A on Tuesday. He will now lose his spot in Seattle's bullpen to make room for Jonathan Hernandez, who was claimed off waivers from Texas on Friday.

AUGUST 3, 2024 • ROTOWIRE

Takes loss in extras 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.

Impact Diaz's first outing of his current big-league tenure, which just began Tuesday, lasted all of three pitches, as he surrendered a game-winning RBI double to Rafael Devers that plated phantom runner Tyler O'Neill. The southpaw has only one other appearance at the big-league level this season, having made a spot start against the White Sox back on June 11. While Diaz did see high-leverage work Wednesday, that's an outlier largely the byproduct of Andres Munoz and Yimi Garcia having worked a combined 3.1 and three innings, respectively, over the previous four days.

AUGUST 1, 2024 • ROTOWIRE

Summoned from minors The Mariners recalled Diaz from Triple-A Tacoma on Tuesday.

Impact Diaz will take Gabe Speier's spot on the 26-man roster, marking Diaz's second MLB stint of the season. The 27-year-old's lone appearance with the Mariners came in June when he allowed three runs on nine hits in 5.1 innings as a starter. He's expected to serve out of the bullpen during this stint but could be called upon if the Mariners need a last-second starter. In 18 Triple-A outings (17 starts), Diaz has a 3.88 ERA with a 95:42 K:BB during 97.1 innings.

JULY 30, 2024 • ROTOWIRE

Summoned from minors The Mariners recalled Diaz from Triple-A Tacoma on Tuesday.

Impact Diaz will take Gabe Speier's spot on the 26-man roster, marking Diaz's second MLB stint of the season. The 27-year-old's lone appearance with the Mariners came in June when he allowed three runs on nine hits in 5.1 innings as a starter. He's expected to serve out of the bullpen during this stint but could be called upon if the Mariners need a last-second starter. In 18 Triple-A outings (17 starts) Diaz has a 3.88 ERA with a 95:42 K:BB during 97.1 innings.

JULY 30, 2024 • ROTOWIRE

Returns to Triple-A The Mariners optioned Diaz to Triple-A Tacoma on Tuesday, Ryan Divish of The Seattle Times reports.

Impact The 27-year-old was called up by the Mariners on Friday but didn't action during his brief time with the team. Diaz has made one start for the Mariners this season and allowed three earned runs with a 4:1 K:BB over 5.1 innings. He's pitched to a 3.26 ERA across 77.1 frames at Tacoma.

JULY 2, 2024 • ROTOWIRE

Added to 40-man roster The Mariners added Diaz to their 40-man roster Wednesday, Daniel Kramer of MLB.com reports.

Impact Diaz got off to a hot start at Triple-A Tacoma, allowing just one earned run while striking out 27 batters across 24 frames through his first four outings. He has since slowed down, but the 27-year-old southpaw still holds a solid 3.18 ERA and 1.10 WHIP alongside a 55:9 K:BB through 51 innings. He will remain in the minors for the time being, but continued success could allow him to make his Mariners debut later this summer -- likely as a long reliever.

MAY 22, 2024 • ROTOWIRE

Inks minors pact with Seattle Diaz has signed a minor-league contract with the Mariners, Matt Eddy of Baseball America reports.

Impact Diaz, 27, holds a 4.84 ERA and 24:24 K:BB over 35.1 frames covering parts of three seasons at the big-league level. The left-hander has experience as a starter and reliever and is likely headed to Triple-A Tacoma at the beginning of the 2024 season.

JANUARY 10, 2024 • ROTOWIRE

Loses 40-man roster spot Diaz cleared waivers and was outrighted to Triple-A Salt Lake on Monday, Jeff Fletcher of The Orange County Register reports.

Impact The Angels are doing some 40-man roster housecleaning and Diaz is one of the guys to lose his spot. He will remain in the organization.

OCTOBER 16, 2023 • ROTOWIRE

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Mariners acquire right-hander Cooper Criswell from Mets for cash

Mariners use sharp pitching and timely hitting to deliver strong road start

Mariners right-hander Bryce Miller placed on 15-day injured list with right elbow inflammation