Brian Serven

C · R/R · age 31.4 · ATH

XX-DOCTOBER OK

Roster status
ACTIVE
Service thru 2025
1+089
Service now / projected
1+162 / 2+003
Option years left (2026)
1
Assignments left this season
3 of 5
Contract (2027)
PRE-ARBITRATION / AUTO-RENEWAL
Acquired
Free Agent (DET) Dec'25
Outrighted / DFA'd before
2 / 2
Contract
none listed

Next 90 days, by the model

Stays put
46%
Designated
42%
Optioned
10%
Traded
2%
Released or non-tendered
1%

Pushing the cut risk up: age (31.36) raises it, this season's WAR (0.20) raises it, prior DFAs (2) raises it.

Context the model does not weigh: ZiPS projects 0.4 WAR, 0.2 WAR this season; 2 C on the 40-man, of whom Jonah Heim 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?

ATH returns 1 C on the 40-man once 1 free agent leaves; about 3 C jobs survive a normal winter. By his own recent record he ranks 1st among the returners (0.4 WAR against a bar of 0.4), which the calibrated model turns into 45% kept through the tender deadline. Ranked by ZiPS and Steamer instead, which credit his longer track record, he is 1st (0.2 WAR, bar 0.2), worth 46% kept on the same model.

By recent record: returning CProj. WAR
1. Brian Serven0.4
By ZiPS / Steamer: returning CProj. WAR
1. Brian Serven0.2

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. He has 15 option days this season; at 20 a 2026 option year is used and those days stop counting as service. Once down he must stay 10 days unless he replaces an injured or traded player. An option does not trigger his Article XX-D right; only an outright would.
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. He was outrighted before (2x) give him the Article XX-D choice: elect free agency immediately (giving up the rest of his salary) or accept the assignment, keep getting paid, and elect free agency after the season unless he is added back to a 40-man first. 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
202615no (under 20)Jul 7, 2026 to Jul 11, 2026 (4d)Jul 15, 2026 to Jul 26, 2026 (11d)
2024101yesApr 15, 2024 to Jul 1, 2024 (77d)Jul 4, 2024 to Jul 28, 2024 (24d)
2023146yesMay 5, 2023 to Jun 11, 2023 (37d)Jun 15, 2023 to Oct 2, 2023 (109d)

Transaction log

Jul 26, 2026RecalledAthletics recalled C Brian Serven from Las Vegas Aviators.
Jul 15, 2026OptionedAthletics optioned C Brian Serven to Las Vegas Aviators.
Jul 11, 2026RecalledAthletics recalled C Brian Serven from Las Vegas Aviators.
Jul 7, 2026OptionedAthletics optioned C Brian Serven to Las Vegas Aviators.
Jul 4, 2026Contract selectedAthletics selected the contract of C Brian Serven from Las Vegas Aviators.
Dec 19, 2025Signed as free agentAthletics signed free agent C Brian Serven to a minor league contract.
Dec 13, 2024Signed as free agentDetroit Tigers signed free agent C Brian Serven to a minor league contract.
Sep 19, 2024OutrightedToronto Blue Jays sent C Brian Serven outright to Buffalo Bisons.
Sep 16, 2024Designated for assignmentToronto Blue Jays designated C Brian Serven for assignment.
Jul 28, 2024RecalledToronto Blue Jays recalled C Brian Serven from Buffalo Bisons.
Jul 4, 2024OptionedToronto Blue Jays optioned C Brian Serven to Buffalo Bisons.
Jul 1, 2024RecalledToronto Blue Jays recalled C Brian Serven from Buffalo Bisons.
Apr 15, 2024OptionedToronto Blue Jays optioned C Brian Serven to Buffalo Bisons.
Mar 28, 2024Contract selectedToronto Blue Jays selected the contract of C Brian Serven from Buffalo Bisons.
Mar 28, 2024Status changeToronto Blue Jays activated C Brian Serven.
Jan 29, 2024OutrightedToronto Blue Jays sent C Brian Serven outright to Buffalo Bisons.
Jan 16, 2024Claimed off waiversToronto Blue Jays claimed C Brian Serven off waivers from Chicago Cubs.
Jan 11, 2024Designated for assignmentChicago Cubs designated C Brian Serven for assignment.
Jan 5, 2024Claimed off waiversChicago Cubs claimed C Brian Serven off waivers from Colorado Rockies.
Oct 2, 2023RecalledColorado Rockies recalled C Brian Serven from Albuquerque Isotopes.
Jun 15, 2023OptionedColorado Rockies optioned C Brian Serven to Albuquerque Isotopes.
Jun 11, 2023RecalledColorado Rockies recalled C Brian Serven from Albuquerque Isotopes.
May 5, 2023OptionedColorado Rockies optioned C Brian Serven to Albuquerque Isotopes.
May 17, 2022Status changeColorado Rockies activated C Brian Serven.
May 17, 2022Contract selectedColorado Rockies selected the contract of C Brian Serven from Albuquerque Isotopes.
Jun 16, 2016SignedColorado Rockies signed C Brian Serven.

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.