Zack Kelly
RP · R/R · age 31.5 · BOSXX-D60-DAY ILOCTOBER: REINSTATE
60-DAY IL (Elbow inflammation)
2+134
3+067 / 3+080
1 (using one in 2026)
4 of 5
SALARY ARBITRATION ELIGIBLE
Free Agent (LAA) Jan'21
0 / 0
none listed
Next 90 days, by the model
64%
28%
5%
2%
<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 RP | Proj. WAR |
|---|---|
| 1. Garrett Whitlock | 3.5 |
| 2. Justin Slaten | 1.6 |
| 3. Tayron Guerrero | 1.6 |
| 4. Brayan Bello | 1.2 |
| 5. Erik Miller | 0.9 |
| 6. Alec Gamboa | 0.8 |
| 7. Greg Weissert | 0.7 |
| 8. Tyler Samaniego | 0.4 |
| 9. Zack Kellylast job | 0.4 |
| 10. Wyatt Olds | 0.2 |
| 11. Jovani Moran | 0.1 |
| 12. Raymond Burgos | 0.1 |
| By ZiPS / Steamer: returning RP | Proj. WAR |
|---|---|
| 1. Brayan Bello | 2.0 |
| 2. Garrett Whitlock | 1.1 |
| 3. Jovani Moran | 0.5 |
| 4. Justin Slaten | 0.3 |
| 5. Erik Miller | 0.3 |
| 6. Greg Weissert | 0.2 |
| 7. Zack Kelly | 0.1 |
| 8. Tyler Samaniego | 0.1 |
| 9. Raymond Burgoslast job | 0.0 |
| 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 and the 20-day rule1 option year left entering 2026; 69 option days this season uses one (0 after 2026).A season with fewer than 20 days on optional assignment does not count as an option year, and those days count as Major League service. 2022-2026 Basic Agreement, Article XIX(E) and XXI(B), p. 98 (the number itself is in Major League Rule 7(c))
- Five optional assignments per seasonOptioned 1 time this season that count toward the cap of 5: 4 left.A player can be optioned at most five times in a season; a sixth trip requires outright waivers. 2022-2026 Basic Agreement, Article XIX(E), p. 98 (the number itself is in Major League Rule 7(c))
- Article XX-D: the right to walkCrossed 3 years of service this season: may elect free agency if outrighted.A player with three or more years of service (or a Super Two), or any player being outrighted for the second time in his career, may elect free agency instead of accepting the outright. 2022-2026 Basic Agreement, Article XX(D)(1)-(2), (4), p. 110
- 60-day IL and the November crunchOn the 60-day IL: not counting against the 40-man now, but must be reinstated by Nov 5 (5th day after the World Series).A player on the 60-day IL is off the 40-man, but every 60-day IL player must be reinstated after the World Series, healthy or not. 2022-2026 Basic Agreement, Article XIII(C), p. 56 (the number itself is in Major League Rule 2)
- Injured players cannot be sent downOn the Major League injured list: cannot be optioned or outrighted until he is healthy and reinstated, so an injured fringe player keeps his roster spot by default.No assignment to a minor-league club while a player is on a Major League injured list, and an injured player who cannot play cannot be optioned or outrighted. 2022-2026 Basic Agreement, Article XIX(C)(1)-(2), p. 96
- Post-season roster eligibilityOn 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. 2022-2026 Basic Agreement, Attachment 25, p. 253 (the number itself is in Major League Rule 40)
- Rule 5 clockOn a 40-man roster (would first be exposed after 2020 otherwise).
Option years, season by season
| Season | Days on option | Option year used | Stints |
|---|---|---|---|
| 2026 | 69 | yes | Mar 23, 2026 to Apr 3, 2026 (9d, spring training)May 22, 2026 to Jul 21, 2026 (60d) |
| 2025 | 70 | yes | Apr 22, 2025 to May 25, 2025 (33d)May 27, 2025 to Jun 3, 2025 (7d)Aug 2, 2025 to Sep 1, 2025 (30d) |
| 2024 | 60 | yes | Mar 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, 2026 | Status change | Boston Red Sox placed RHP Zack Kelly on the 60-day injured list. Right elbow inflammation. |
| Jul 21, 2026 | Recalled | Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox. |
| May 22, 2026 | Optioned | Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox. |
| Apr 3, 2026 | Recalled | Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox. |
| Mar 23, 2026 | Optioned | Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox. |
| Sep 1, 2025 | Recalled | Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox. |
| Aug 2, 2025 | Optioned | Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox. |
| Jun 3, 2025 | Recalled | Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox. |
| May 27, 2025 | Optioned | Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox. |
| May 25, 2025 | Recalled | Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox. |
| Apr 22, 2025 | Optioned | Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox. |
| Oct 1, 2024 | Recalled | Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox. |
| Sep 14, 2024 | Optioned | Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox. |
| Jun 5, 2024 | Recalled | Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox. |
| May 26, 2024 | Optioned | Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox. |
| Apr 24, 2024 | Recalled | Boston Red Sox recalled RHP Zack Kelly from Worcester Red Sox. |
| Mar 22, 2024 | Optioned | Boston Red Sox optioned RHP Zack Kelly to Worcester Red Sox. |
| Sep 24, 2023 | Status change | Boston Red Sox activated RHP Zack Kelly from the 60-day injured list. |
| Apr 16, 2023 | Status change | Boston Red Sox transferred RHP Zack Kelly from the 15-day injured list to the 60-day injured list. Right elbow inflammation. |
| Apr 13, 2023 | Status change | Boston Red Sox placed RHP Zack Kelly on the 15-day injured list. Right elbow inflammation. |
| Sep 5, 2022 | Status change | Boston Red Sox activated RHP Zack Kelly from the paternity list. |
| Sep 2, 2022 | Status change | Boston Red Sox placed RHP Zack Kelly on the paternity list. |
| Aug 29, 2022 | Contract selected | Boston Red Sox selected the contract of RHP Zack Kelly from Worcester Red Sox. |
| Jan 4, 2021 | Signed as free agent | Boston Red Sox signed free agent RHP Zack Kelly to a minor league contract. |
| Apr 27, 2018 | Signed as free agent | Los Angeles Angels signed free agent RHP Zack Kelly to a minor league contract. |
| Jun 16, 2017 | Signed as free agent | Oakland 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.