Cam Booser
RP · L/L · age 34.4 · TBOCTOBER OK
ACTIVE
1+105
2+040 / 2+053
1 (using one in 2026)
4 of 5
PRE-ARBITRATION / AUTO-RENEWAL
Free Agent (CHW) Jan'26
0 / 0
none listed
Next 90 days, by the model
95%
1%
3%
1%
<1%
Pushing the cut risk around: age (34.36) raises it, this season's WAR (0.61) lowers it, this season's strikeout rate (0.30) lowers it.
Context the model does not weigh: ZiPS projects 0.2 WAR, 0.6 WAR this season; 14 RP on the 40-man.
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?
TB returns 14 RP on the 40-man once nobody 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 93% kept through the tender deadline. Ranked by ZiPS and Steamer instead, which credit his longer track record, he is 11th (0.1 WAR, bar 0.3), worth 93% kept on the same model.
| By recent record: returning RP | Proj. WAR |
|---|---|
| 1. Tyler Wells | 1.7 |
| 2. Bryan Baker | 1.5 |
| 3. Edwin Uceta | 1.5 |
| 4. Cole Sulser | 0.9 |
| 5. Manuel Rodriguez | 0.9 |
| 6. Kevin Kelly | 0.8 |
| 7. Garrett Cleavinger | 0.7 |
| 8. Steven Matz | 0.6 |
| 9. Cam Booserlast job | 0.4 |
| 10. Casey Legumina | 0.3 |
| 11. Ty Johnson | 0.1 |
| 12. Alex Cook | -0.2 |
| By ZiPS / Steamer: returning RP | Proj. WAR |
|---|---|
| 1. Steven Matz | 1.5 |
| 2. Garrett Cleavinger | 0.8 |
| 3. Ty Johnson | 0.7 |
| 4. Tyler Wells | 0.6 |
| 5. Edwin Uceta | 0.6 |
| 6. Bryan Baker | 0.6 |
| 7. Brody Hopkins | 0.3 |
| 8. Kevin Kelly | 0.3 |
| 9. Manuel Rodriguezlast job | 0.3 |
| 10. Cole Sulser | 0.2 |
| 11. Cam Booser | 0.1 |
| 12. Casey Legumina | 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. 4 of the five optional assignments for 2026 remain. A 2026 option year is already used (67 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 and the 20-day rule1 option year left entering 2026; 67 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))
- Post-season roster eligibilityOn 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. 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 2016 otherwise).
Option years, season by season
| Season | Days on option | Option year used | Stints |
|---|---|---|---|
| 2026 | 67 | yes | Mar 25, 2026 to May 31, 2026 (67d) |
| 2025 | 60 | yes | Jul 13, 2025 to Aug 10, 2025 (28d)Aug 13, 2025 to Aug 28, 2025 (15d)Sep 2, 2025 to Sep 19, 2025 (17d) |
| 2024 | 34 | yes | Jun 24, 2024 to Jul 5, 2024 (11d)Jul 8, 2024 to Jul 12, 2024 (4d)Aug 7, 2024 to Aug 9, 2024 (2d)Sep 14, 2024 to Oct 1, 2024 (17d) |
Transaction log
| May 31, 2026 | Recalled | Tampa Bay Rays recalled LHP Cam Booser from Durham Bulls. |
| Mar 25, 2026 | Optioned | Tampa Bay Rays optioned LHP Cam Booser to Durham Bulls. |
| Mar 25, 2026 | Contract selected | Tampa Bay Rays selected the contract of LHP Cam Booser from Durham Bulls. |
| Jan 26, 2026 | Signed as free agent | Tampa Bay Rays signed free agent LHP Cam Booser to a minor league contract. |
| Nov 21, 2025 | Declared free agent | LHP Cam Booser elected free agency. |
| Sep 19, 2025 | Recalled | Chicago White Sox recalled LHP Cam Booser from Charlotte Knights. |
| Sep 2, 2025 | Optioned | Chicago White Sox optioned LHP Cam Booser to Charlotte Knights. |
| Aug 28, 2025 | Recalled | Chicago White Sox recalled LHP Cam Booser from Charlotte Knights. |
| Aug 13, 2025 | Optioned | Chicago White Sox optioned LHP Cam Booser to Charlotte Knights. |
| Aug 10, 2025 | Recalled | Chicago White Sox recalled LHP Cam Booser from Charlotte Knights. |
| Jul 13, 2025 | Optioned | Chicago White Sox optioned LHP Cam Booser to Charlotte Knights. |
| Jul 13, 2025 | Status change | Chicago White Sox activated LHP Cam Booser from the 15-day injured list. |
| Jun 20, 2025 | Status change | Chicago White Sox placed LHP Cam Booser on the 15-day injured list. Left shoulder strain. |
| Dec 21, 2024 | Traded | Boston Red Sox traded LHP Cam Booser to Chicago White Sox for RHP Yhoiker Fajardo. |
| Oct 1, 2024 | Recalled | Boston Red Sox recalled LHP Cam Booser from Worcester Red Sox. |
| Sep 14, 2024 | Optioned | Boston Red Sox optioned LHP Cam Booser to Worcester Red Sox. |
| Sep 11, 2024 | Status change | Boston Red Sox activated LHP Cam Booser from the 15-day injured list. |
| Aug 14, 2024 | Status change | Boston Red Sox placed LHP Cam Booser on the 15-day injured list. Left elbow inflammation. |
| Aug 9, 2024 | Recalled | Boston Red Sox recalled LHP Cam Booser from Worcester Red Sox. |
| Aug 7, 2024 | Optioned | Boston Red Sox optioned LHP Cam Booser to Worcester Red Sox. |
| Jul 12, 2024 | Recalled | Boston Red Sox recalled LHP Cam Booser from Worcester Red Sox. |
| Jul 8, 2024 | Optioned | Boston Red Sox optioned LHP Cam Booser to Worcester Red Sox. |
| Jul 5, 2024 | Recalled | Boston Red Sox recalled LHP Cam Booser from Worcester Red Sox. |
| Jun 24, 2024 | Optioned | Boston Red Sox optioned LHP Cam Booser to Worcester Red Sox. |
| Apr 19, 2024 | Contract selected | Boston Red Sox selected the contract of LHP Cam Booser from Worcester Red Sox. |
| Feb 6, 2023 | Signed as free agent | Boston Red Sox signed free agent LHP Cam Booser to a minor league contract. |
| Feb 16, 2022 | Signed as free agent | Arizona Diamondbacks signed free agent LHP Cam Booser to a minor league contract. |
| Aug 12, 2013 | Signed as free agent | Minnesota Twins signed free agent LHP Cameron Booser 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 2). Rule 5 exposure deadline Nov 17, 2026.