Zack Kelly

RP · R/R · age 31.5 · BOS

XX-D60-DAY ILOCTOBER: REINSTATE

Roster status
60-DAY IL (Elbow inflammation)
Service thru 2025
2+134
Service now / projected
3+067 / 3+080
Option years left (2026)
1 (using one in 2026)
Assignments left this season
4 of 5
Contract (2027)
SALARY ARBITRATION ELIGIBLE
Acquired
Free Agent (LAA) Jan'21
Outrighted / DFA'd before
0 / 0
Contract
none listed

Next 90 days, by the model

Stays put
64%
Designated
28%
Optioned
5%
Traded
2%
Released or non-tendered
<1%

Pushing the cut risk up: age (31.53) raises it, roster status (2) raises it, this season's WAR (0.15) raises it.

Context the model does not weigh: ZiPS projects 0.0 WAR, 0.1 WAR this season; 13 RP on the 40-man, of whom Aroldis Chapman 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?

BOS returns 12 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 9th among the returners (0.4 WAR against a bar of 0.4), which the calibrated model turns into 44% kept through the tender deadline. Ranked by ZiPS and Steamer instead, which credit his longer track record, he is 7th (0.1 WAR, bar 0.0), worth 47% kept on the same model.

By recent record: returning RPProj. WAR
1. Garrett Whitlock3.5
2. Justin Slaten1.6
3. Tayron Guerrero1.6
4. Brayan Bello1.2
5. Erik Miller0.9
6. Alec Gamboa0.8
7. Greg Weissert0.7
8. Tyler Samaniego0.4
9. Zack Kellylast job0.4
10. Wyatt Olds0.2
11. Jovani Moran0.1
12. Raymond Burgos0.1
By ZiPS / Steamer: returning RPProj. WAR
1. Brayan Bello2.0
2. Garrett Whitlock1.1
3. Jovani Moran0.5
4. Justin Slaten0.3
5. Erik Miller0.3
6. Greg Weissert0.2
7. Zack Kelly0.1
8. Tyler Samaniego0.1
9. Raymond Burgoslast job0.0
10. Alec Gamboa-0.0
11. Tayron Guerrero-0.1
12. Wyatt Olds-0.2

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: Eligible once reinstated

On the 60-day IL before the cutoff, so he is on the eligibility list. He has served 55 of the 60 required days (eligible to be activated from Sep 19), then must be reinstated to the 40-man and 26-man.

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 while he is on the injured list. He must be healthy and reinstated first; a rehab assignment (20 days, 30 for pitchers, with his consent) is the only way to send him down injured.
Injured players cannot be sent down
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. Three-plus years of service 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. Because he is on the injured list he cannot be outrighted until he is healthy and reinstated, so a DFA now would have to end in a trade or a release.
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
non-tender him
At the tender deadline (Nov 20) the club can decline to offer a contract: no waivers, no termination pay, and he can be re-signed the same night. Tendering means arbitration, where he cannot be cut more than 20% from this year's salary.
Tender deadline · Arbitration: 3 to 6 years · Maximum salary cut

What the rules say about him

Option years, season by season

SeasonDays on optionOption year usedStints
202669yesMar 23, 2026 to Apr 3, 2026 (9d, spring training)May 22, 2026 to Jul 21, 2026 (60d)
202570yesApr 22, 2025 to May 25, 2025 (33d)May 27, 2025 to Jun 3, 2025 (7d)Aug 2, 2025 to Sep 1, 2025 (30d)
202460yesMar 22, 2024 to Apr 24, 2024 (33d)May 26, 2024 to Jun 5, 2024 (10d)Sep 14, 2024 to Oct 1, 2024 (17d)

Transaction log

Jul 21, 2026Status changeBoston Red Sox placed RHP Zack Kelly on the 60-day injured list. Right elbow inflammation.
Jul 21, 2026RecalledBoston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
May 22, 2026OptionedBoston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
Apr 3, 2026RecalledBoston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
Mar 23, 2026OptionedBoston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
Sep 1, 2025RecalledBoston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
Aug 2, 2025OptionedBoston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
Jun 3, 2025RecalledBoston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
May 27, 2025OptionedBoston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
May 25, 2025RecalledBoston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
Apr 22, 2025OptionedBoston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
Oct 1, 2024RecalledBoston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
Sep 14, 2024OptionedBoston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
Jun 5, 2024RecalledBoston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
May 26, 2024OptionedBoston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
Apr 24, 2024RecalledBoston Red Sox recalled RHP Zack Kelly from Worcester Red Sox.
Mar 22, 2024OptionedBoston Red Sox optioned RHP Zack Kelly to Worcester Red Sox.
Sep 24, 2023Status changeBoston Red Sox activated RHP Zack Kelly from the 60-day injured list.
Apr 16, 2023Status changeBoston Red Sox transferred RHP Zack Kelly from the 15-day injured list to the 60-day injured list. Right elbow inflammation.
Apr 13, 2023Status changeBoston Red Sox placed RHP Zack Kelly on the 15-day injured list. Right elbow inflammation.
Sep 5, 2022Status changeBoston Red Sox activated RHP Zack Kelly from the paternity list.
Sep 2, 2022Status changeBoston Red Sox placed RHP Zack Kelly on the paternity list.
Aug 29, 2022Contract selectedBoston Red Sox selected the contract of RHP Zack Kelly from Worcester Red Sox.
Jan 4, 2021Signed as free agentBoston Red Sox signed free agent RHP Zack Kelly to a minor league contract.
Apr 27, 2018Signed as free agentLos Angeles Angels signed free agent RHP Zack Kelly to a minor league contract.
Jun 16, 2017Signed as free agentOakland Athletics signed free agent RHP Zack Kelly 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 1). Rule 5 exposure deadline Nov 17, 2026.