Riley O'Brien
RP · R/R · age 31.6 · STLOUT OF OPTIONSXX-DSUPER TWO?OCTOBER OK
ACTIVE
1+129
2+129 / 2+129
0
n/a of 5
SALARY ARBITRATION ELIGIBLE ("SUPER TWO") OR PRE-ARBITRATION / AUTO-RENEWAL (TBD)
Purchased (SEA) Nov'23
1 / 2
1 yr, $795.05k (2026)
Next 90 days, by the model
81%
4%
<1%
15%
<1%
Pushing the cut risk around: age (31.60) raises it, this season's innings (60) lowers it, prior DFAs (2) raises it.
Context the model does not weigh: ZiPS projects 0.1 WAR, 0.4 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?
STL 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 3rd among the returners (0.6 WAR against a bar of 0.0), which the calibrated model turns into 70% kept through the tender deadline. Ranked by ZiPS and Steamer instead, which credit his longer track record, he is 3rd (0.2 WAR, bar 0.1), worth 71% kept on the same model.
| By recent record: returning RP | Proj. WAR |
|---|---|
| 1. Matt Svanson | 0.8 |
| 2. Gordon Graceffo | 0.7 |
| 3. Riley O'Brien | 0.6 |
| 4. Justin Bruihl | 0.3 |
| 5. Ryan Fernandez | 0.3 |
| 6. Cooper Hjerpe | 0.2 |
| 7. Cade Winquest | 0.2 |
| 8. Max Rajcic | 0.0 |
| 9. Luis Gastelumlast job | 0.0 |
| 10. Ryne Stanek | -0.0 |
| 11. Peter Strzelecki | -0.1 |
| 12. Brycen Mautz | -0.5 |
| By ZiPS / Steamer: returning RP | Proj. WAR |
|---|---|
| 1. Gordon Graceffo | 0.5 |
| 2. Brycen Mautz | 0.4 |
| 3. Riley O'Brien | 0.2 |
| 4. Matt Svanson | 0.2 |
| 5. Ryne Stanek | 0.2 |
| 6. Luis Gastelum | 0.2 |
| 7. Hancel Rincon | 0.2 |
| 8. Ryan Fernandez | 0.2 |
| 9. Max Rajciclast job | 0.1 |
| 10. Justin Bruihl | 0.1 |
| 11. Cade Winquest | 0.0 |
| 12. Cooper Hjerpe | 0.0 |
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
- Out of options: the only route to the minors is outright waivers, where any club can claim him for $50,000.
- Out of options
- 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 (1 yr, $795.05k (2026)). He was outrighted before (1x) 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
- 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
- Out of optionsUsed option years in 2021, 2022, 2025: cannot be sent down without clearing outright waivers.With no option years left, the only way to the minors is through irrevocable outright waivers. 2022-2026 Basic Agreement, Article XIX(E) and XIX(F), p. 98 (the number itself is in Major League Rules 7 and 8)
- Article XX-D: the right to walkOutrighted before (Jun 2022): a second outright lets him elect free agency, so he cannot be stashed in the minors against his will.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
- Super TwoProjects to 2+129: within 30 days of last year's cutoff; Super Two status depends on this fall's line.A player with two but fewer than three years of service is arbitration-eligible if he had 86+ days last season and ranks in the top 22% of that group by total service; ties at the line all qualify. 2022-2026 Basic Agreement, Article VI(E)(1)(b), p. 17
- 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 2020 otherwise).
Option years, season by season
| Season | Days on option | Option year used | Stints |
|---|---|---|---|
| 2025 | 75 | yes | Mar 15, 2025 to Apr 25, 2025 (38d, spring training)May 2, 2025 to Jun 5, 2025 (34d)Jun 6, 2025 to Jun 9, 2025 (3d) |
| 2024 | 16 | no (under 20) | Aug 11, 2024 to Aug 27, 2024 (16d) |
| 2022 | 43 | yes | Mar 27, 2022 to Apr 13, 2022 (6d, spring training)Apr 17, 2022 to May 5, 2022 (18d)May 8, 2022 to May 27, 2022 (19d) |
| 2021 | 184 | yes | Mar 12, 2021 to Sep 28, 2021 (180d, spring training)Sep 30, 2021 to Oct 5, 2021 (4d) |
Transaction log
| Jul 13, 2026 | Status change | National League All-Stars activated RHP Riley O'Brien. |
| Jun 9, 2025 | Recalled | St. Louis Cardinals recalled RHP Riley O'Brien from Memphis Redbirds. |
| Jun 6, 2025 | Optioned | St. Louis Cardinals optioned RHP Riley O'Brien to Memphis Redbirds. |
| Jun 5, 2025 | Recalled | St. Louis Cardinals recalled RHP Riley O'Brien from Memphis Redbirds. |
| May 2, 2025 | Optioned | St. Louis Cardinals optioned RHP Riley O'Brien to Memphis Redbirds. |
| Apr 25, 2025 | Recalled | St. Louis Cardinals recalled RHP Riley O'Brien from Memphis Redbirds. |
| Mar 15, 2025 | Optioned | St. Louis Cardinals optioned RHP Riley O'Brien to Memphis Redbirds. |
| Aug 27, 2024 | Recalled | St. Louis Cardinals recalled RHP Riley O'Brien from Memphis Redbirds. |
| Aug 11, 2024 | Optioned | St. Louis Cardinals optioned RHP Riley O'Brien to Memphis Redbirds. |
| Aug 11, 2024 | Status change | St. Louis Cardinals activated RHP Riley O'Brien from the 60-day injured list. |
| May 10, 2024 | Status change | St. Louis Cardinals transferred RHP Riley O'Brien from the 15-day injured list to the 60-day injured list. Right forearm flexor strain. |
| Mar 31, 2024 | Status change | St. Louis Cardinals placed RHP Riley O'Brien on the 15-day injured list retroactive to March 29, 2024. Right forearm flexor strain. |
| Nov 5, 2023 | Traded | Seattle Mariners traded RHP Riley O'Brien to St. Louis Cardinals for cash. |
| Jun 2, 2022 | Outrighted | Seattle Mariners sent RHP Riley O'Brien outright to Tacoma Rainiers. |
| May 27, 2022 | Designated for assignment | Seattle Mariners designated RHP Riley O'Brien for assignment. |
| May 8, 2022 | Optioned | Seattle Mariners optioned RHP Riley O'Brien to Tacoma Rainiers. |
| May 5, 2022 | Recalled | Seattle Mariners recalled RHP Riley O'Brien from Tacoma Rainiers. |
| Apr 17, 2022 | Optioned | Seattle Mariners optioned RHP Riley O'Brien to Tacoma Rainiers. |
| Apr 13, 2022 | Designated for assignment | Cincinnati Reds designated RHP Riley O'Brien for assignment. |
| Mar 27, 2022 | Optioned | Cincinnati Reds optioned RHP Riley O'Brien to Louisville Bats. |
| Oct 5, 2021 | Recalled | Cincinnati Reds recalled RHP Riley O'Brien from Louisville Bats. |
| Sep 30, 2021 | Optioned | Cincinnati Reds optioned RHP Riley O'Brien to Louisville Bats. |
| Sep 28, 2021 | Recalled | Cincinnati Reds recalled RHP Riley O'Brien from Louisville Bats. |
| Mar 12, 2021 | Optioned | Cincinnati Reds optioned P Riley O'Brien to Louisville Bats. |
| Nov 20, 2020 | Contract selected | Cincinnati Reds selected the contract of RHP Riley O'Brien from Chattanooga Lookouts. |
| Aug 28, 2020 | Traded | Tampa Bay Rays traded Riley O'Brien to Cincinnati Reds for LHP Cody Reed. |
| Jun 20, 2017 | Signed | Tampa Bay Rays signed RHP Riley O'Brien. |
Service through 2025 per FanGraphs RosterResource; options and this-season service reconstructed from the MLB transaction log (reconstruction; FanGraphs shows 0). Rule 5 exposure deadline Nov 17, 2026.