Yilber Diaz

RP · R/R · age 26.1 · DET

OCTOBER OK

Roster status
ACTIVE
Service thru 2025
0+041
Service now / projected
0+072 / 0+085
Option years left (2026)
1 (using one in 2026)
Assignments left this season
3 of 5
Contract (2027)
PRE-ARBITRATION / AUTO-RENEWAL
Acquired
Waivers (ARI) Jun'26
Outrighted / DFA'd before
0 / 1
Contract
none listed

Next 90 days, by the model

Stays put
33%
Designated
31%
Optioned
34%
Traded
1%
Released or non-tendered
1%

Pushing the cut risk up: this season's WAR (-0.11) raises it, prior DFAs (1) raises it, option days this season (143) raises it.

Context the model does not weigh: ZiPS projects 0.3 WAR, -0.1 WAR this season; 14 RP on the 40-man, of whom Tyler Kinley, Burch Smith are headed to free agency.

Trained on every 40-man roster snapshot since 2011 and what happened in the following 90 days; it sees roster status, options, service, history and last season's line, not this season's performance or the club's intentions. How well it does.

Is there a job for him next year?

DET returns 11 RP on the 40-man once 2 free agents leave; about 9 RP jobs survive a normal winter. By his own recent record he ranks 9th among the returners (-0.2 WAR against a bar of -0.2), which the calibrated model turns into 83% kept through the tender deadline. Ranked by ZiPS and Steamer instead, which credit his longer track record, he is 10th (0.1 WAR, bar 0.1), worth 89% kept on the same model.

By recent record: returning RPProj. WAR
1. Will Vest2.0
2. Drew Sommers1.2
3. Brant Hurter1.1
4. Kenley Jansen1.0
5. Tyler Holton0.6
6. Brenan Hanifee0.3
7. Kyle Finnegan0.2
8. Beau Brieske-0.2
9. Yilber Diazlast job-0.2
10. Bailey Horn-0.5
11. Jacob Waguespack-0.5
By ZiPS / Steamer: returning RPProj. WAR
1. Will Vest0.8
2. Brant Hurter0.8
3. Tyler Holton0.6
4. Brenan Hanifee0.3
5. Kyle Finnegan0.3
6. Jacob Waguespack0.3
7. Kenley Jansen0.2
8. Beau Brieske0.2
9. Drew Sommerslast job0.1
10. Yilber Diaz0.1
11. Bailey Horn-0.1

Departing free agents are excluded; players on club, mutual or player options are counted as returning. The kept probability is calibrated on every September since 2012 using the recent-record projection; the ZiPS/Steamer reading uses the same model with a different ranking, so treat it as a second opinion rather than a calibrated number. Salary enters once arbitration projections publish in October.

October: Post-season eligible

On the 40-man before noon ET Sep 1. He stays eligible as long as he remains on the 40-man or 60-day IL through the post-season; an outright after the cutoff would end automatic eligibility.

The post-season eligibility list is fixed at noon ET on September 1: everyone on the 40-man, the 60-day IL or the military list at that moment, who then stays there without interruption. Attachment 25 (Major League Rule 40)

What happens if the club…

option him to the minors
Yes, 1 option year left. 3 of the five optional assignments for 2026 remain. A 2026 option year is already used (143 days), so further trips this season cost nothing extra. Once down he must stay 15 days unless he replaces an injured or traded player.
Option years and the 20-day rule · Five optional assignments per season · Minimum stay on option
designate him for assignment (or put him on outright waivers)
The club has 7 days to trade him, pass him through outright waivers, or release him; he is paid at the major-league rate and keeps accruing service in the meantime. On outright waivers any club can claim him for $50,000, worst record first, and the claiming club takes his contract. If he clears, the club can outright him to the minors and he has no say; he stays under club control on a minor-league deal. He would then be Rule 5-eligible and would hold XX-D rights against any future outright. Post-season: an outright after the September 1 cutoff ends his automatic eligibility. He could only return as an approved injury replacement, and only if he accepts the outright and stays on a minor-league reserve list in the organization without interruption; a release makes him ineligible for anyone this October.
Designated for assignment: 7 days · Outright waivers · Article XX-D: the right to walk
release him
Release waivers cost a claiming club $1 but the claimant assumes the whole contract, so expensive players clear. The club owes the full unpaid balance of this season's salary, offset by whatever another club pays him this year. A released player is not post-season eligible for any club this year.
Release waivers and termination pay · Which rate a split contract pays at release
trade himBLOCKED
Not now: players on major-league contracts cannot be traded after the Aug 3 deadline until the day after the World Series.
Trade deadline · 10-and-5 rights · June 15 no-trade for free-agent signees
renew him for next year
Pre-arbitration: the club sets his 2027 salary near the minimum ($780,000 floor) and he has no leverage beyond a non-tender.
Minimum salaries · Tender deadline

What the rules say about him

Option years, season by season

SeasonDays on optionOption year usedStints
2026143yesMar 5, 2026 to Jun 19, 2026 (86d, spring training)Jun 27, 2026 to Aug 4, 2026 (38d)Aug 12, 2026 to Aug 31, 2026 (19d)
2025193yesMar 10, 2025 to Apr 25, 2025 (38d, spring training)Apr 27, 2025 to Sep 29, 2025 (155d)
202450yesJul 29, 2024 to Sep 12, 2024 (45d)Sep 26, 2024 to Oct 1, 2024 (5d)

Transaction log

Aug 31, 2026RecalledDetroit Tigers recalled RHP Yilber Díaz from Toledo Mud Hens.
Aug 12, 2026OptionedDetroit Tigers optioned RHP Yilber Díaz to Toledo Mud Hens.
Aug 4, 2026RecalledDetroit Tigers recalled RHP Yilber Díaz from Toledo Mud Hens.
Jun 27, 2026OptionedDetroit Tigers optioned RHP Yilber Díaz to Toledo Mud Hens.
Jun 26, 2026Claimed off waiversDetroit Tigers claimed RHP Yilber Díaz off waivers from Arizona Diamondbacks.
Jun 21, 2026Designated for assignmentArizona Diamondbacks designated RHP Yilber Díaz for assignment.
Jun 19, 2026RecalledArizona Diamondbacks recalled RHP Yilber Díaz from Reno Aces.
Mar 5, 2026OptionedArizona Diamondbacks optioned RHP Yilber Díaz to Reno Aces.
Sep 29, 2025RecalledArizona Diamondbacks recalled RHP Yilber Díaz from Amarillo Sod Poodles.
Apr 27, 2025OptionedArizona Diamondbacks optioned RHP Yilber Díaz to Reno Aces.
Apr 25, 2025RecalledArizona Diamondbacks recalled RHP Yilber Díaz from Reno Aces.
Mar 10, 2025OptionedArizona Diamondbacks optioned RHP Yilber Diaz to Reno Aces.
Oct 1, 2024RecalledArizona Diamondbacks recalled RHP Yilber Diaz from ACL D-backs.
Sep 26, 2024OptionedArizona Diamondbacks optioned RHP Yilber Diaz to ACL D-backs.
Sep 12, 2024RecalledArizona Diamondbacks recalled RHP Yilber Diaz from Reno Aces.
Jul 29, 2024OptionedArizona Diamondbacks optioned RHP Yilber Diaz to Reno Aces.
Jul 8, 2024Contract selectedArizona Diamondbacks selected the contract of RHP Yilber Diaz from Reno Aces.
Feb 5, 2021Signed as free agentArizona Diamondbacks signed free agent P Yilber Diaz.

Service through 2025 per FanGraphs RosterResource; options and this-season service reconstructed from the MLB transaction log (reconstruction; FanGraphs shows 1). Rule 5 exposure deadline Nov 17, 2026.