Seranthony Dominguez

RP · R/R · age 31.8 · SEA

XIX-AOCTOBER OK

Roster status
ACTIVE
Service thru 2025
7+131
Service now / projected
8+131 / 8+131
Option years left (2026)
1
Assignments left this season
5 of 5
Contract (2027)
SIGNED THRU 2027 + 2028 MUTUAL OPTION
Acquired
Trade (CHW) Aug'26
Outrighted / DFA'd before
0 / 0
Contract
2 yr, $20M (2026-27), 2028 mutual option

Next 90 days, by the model

Stays put
95%
Designated
2%
Optioned
<1%
Traded
2%
Released or non-tendered
<1%

Pushing the cut risk around: this season's WAR (-0.23) raises it, age (31.80) raises it, this season's innings (56.20) lowers it.

Context the model does not weigh: ZiPS projects 0.4 WAR, -0.2 WAR this season; 15 RP on the 40-man, of whom Hoby Milner is 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?

SEA returns 14 RP on the 40-man once 1 free agent leaves; about 9 RP jobs survive a normal winter. By his own recent record he ranks 6th among the returners (0.3 WAR against a bar of 0.0), which the calibrated model turns into 91% kept through the tender deadline. Ranked by ZiPS and Steamer instead, which credit his longer track record, he is 6th (0.5 WAR, bar 0.0), worth 91% kept on the same model.

By recent record: returning RPProj. WAR
1. Andres Muñoz2.1
2. Matt Brash1.3
3. Gabe Speier1.3
4. Jose A. Ferrer1.1
5. Cooper Criswell0.6
6. Seranthony Dominguez0.3
7. Michael Rucker0.1
8. Eduard Bazardo0.0
9. Robinson Ortizlast job0.0
10. Cole Wilcox-0.1
11. Troy Taylor-0.3
12. Nick Davila-0.4
By ZiPS / Steamer: returning RPProj. WAR
1. Andres Muñoz0.8
2. Matt Brash0.7
3. Jose A. Ferrer0.7
4. Cooper Criswell0.5
5. Gabe Speier0.5
6. Seranthony Dominguez0.5
7. Eduard Bazardo0.4
8. Cole Wilcox0.2
9. Nick Davilalast job0.0
10. Michael Rucker0.0
11. Robinson Ortiz-0.1
12. Carlos M. Vargas-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 minorsBLOCKED
Not without his consent: with five years of service he can refuse the assignment or elect free agency instead. The club's only unilateral moves are to keep him, trade him, or release him.
Article XIX-A: five years, no forced assignment
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 (2 yr, $20M (2026-27), 2028 mutual option). If he clears, he cannot be outrighted without his consent: he can refuse and force a release with his contract intact, or elect free agency (forfeiting termination pay). 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. With real money left on the contract a claim is unlikely; the usual outcome is clearing waivers, then release, with the club paying the balance less what a new club pays him.
Designated for assignment: 7 days · Outright waivers · Article XIX-A: five years, no forced outright
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. The guaranteed years remain owed in full. 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
Let the season end
Under contract (2 yr, $20M (2026-27), 2028 mutual option): nothing to decide this winter. Moving him later means trading the contract or releasing him and paying the guaranteed years in full.
Release waivers and termination pay

What the rules say about him

Option years, season by season

SeasonDays on optionOption year usedStints
202131yesSep 1, 2021 to Oct 2, 2021 (31d)
201839yesMar 13, 2018 to May 7, 2018 (39d, spring training)

Transaction log

Aug 4, 2026Status changeSeattle Mariners activated RHP Seranthony Domínguez.
Aug 2, 2026TradedSeattle Mariners traded RHP Luis Castillo to Chicago White Sox for RHP Seranthony Domínguez, C Boston Smith, RF Nolan Jones and cash.
Jan 29, 2026Signed as free agentChicago White Sox signed free agent RHP Seranthony Domínguez.
Nov 2, 2025Declared free agentRHP Seranthony Domínguez elected free agency.
Jul 29, 2025Status changeToronto Blue Jays activated RHP Seranthony Domínguez.
Jul 29, 2025TradedBaltimore Orioles traded RHP Seranthony Domínguez and cash to Toronto Blue Jays for RHP Juaron Watts-Brown.
Apr 16, 2025Status changeBaltimore Orioles activated RHP Seranthony Domínguez.
Jul 26, 2024TradedBaltimore Orioles traded RF Austin Hays to Philadelphia Phillies for RHP Seranthony Domínguez and CF Cristian Pache.
Jul 25, 2023Status changePhiladelphia Phillies activated RHP Seranthony Domínguez from the 15-day injured list.
Jun 17, 2023Status changePhiladelphia Phillies placed RHP Seranthony Domínguez on the 15-day injured list retroactive to June 16, 2023. Left oblique strain.
Sep 11, 2022Status changePhiladelphia Phillies activated RHP Seranthony Domínguez from the 15-day injured list.
Aug 21, 2022Status changePhiladelphia Phillies placed RHP Seranthony Dominguez on the 15-day injured list retroactive to August 18, 2022. Right triceps tendinitis.
Oct 2, 2021RecalledPhiladelphia Phillies recalled RHP Seranthony Dominguez, and from Lehigh Valley IronPigs.
Sep 1, 2021OptionedPhiladelphia Phillies optioned RHP Seranthony Dominguez to Lehigh Valley IronPigs.
Feb 17, 2021Status changePhiladelphia Phillies placed RHP Seranthony Dominguez on the 60-day injured list. Recovering from Tommy John surgery.
Nov 2, 2020Status changePhiladelphia Phillies activated RHP Seranthony Dominguez from the 60-day injured list.
Jun 28, 2020Status changePhiladelphia Phillies placed RHP Seranthony Dominguez on the 60-day injured list. Right elbow sprain.
Nov 4, 2019Status changePhiladelphia Phillies activated RHP Seranthony Dominguez from the 60-day injured list.
Jul 20, 2019Status changePhiladelphia Phillies transferred RHP Seranthony Dominguez from the 10-day injured list to the 60-day injured list. Right UCL injury
Jun 7, 2019Status changePhiladelphia Phillies placed RHP Seranthony Dominguez on the 10-day injured list retroactive to June 6, 2019. Right UCL injury
May 7, 2018RecalledPhiladelphia Phillies recalled RHP Seranthony Dominguez from Lehigh Valley IronPigs.
Mar 13, 2018OptionedPhiladelphia Phillies optioned RHP Seranthony Dominguez to Reading Fightin Phils.
Nov 20, 2017Contract selectedPhiladelphia Phillies selected the contract of Seranthony Dominguez from Clearwater Threshers.
May 31, 2012Signed as free agentPhiladelphia Phillies signed free agent RHP Seranthony Dominguez to a minor league contract.

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