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RILEY O'BRIEN
RILEY O'BRIEN #61 - PITCHER - ST. LOUIS CARDINALS
3-9  W-L  •
1.28  WHIP  •
4.08  ERA 
#61 - PITCHER - ST. LOUIS CARDINALS
3-9 W-L
1.28 WHIP
4.08 ERA
MLB > ST. LOUIS CARDINALS >

RILEY O'BRIEN NEWS

NEWS

BIO

STATS

VIDEOS

GAME LOG

INJURIES

Hochman: 'It's incredible.' Riley O'Brien plays for the St. Louis Cardinals. So did his grandpa. Cardinals pitcher Riley O'Brien is one of 10 big-leaguers to ever play for the same team their grandpa did.
MARCH 2, 2025 • STLTODAY.COM

Austin Wells hits 2 homers to power Yankees to 6-3 win over Cardinals

Austin Wells hit two-run homers in the third and eighth innings, powering the New York Yankees to a 6-3 victory over the St. Louis Cardinals
AUGUST 31, 2024 • Associated Press
Recalled from Triple-A The Cardinals recalled O'Brien from Triple-A Memphis on Tuesday, Katie Woo of The Athletic reports.
Impact O'Brien made the Cardinals' Opening Day roster but suffered a flexor strain in his first appearance and missed the remainder of the first half. He has pitched well since resurfacing at Memphis, posting a 1.35 ERA and 9:5 K:BB over 13.1 innings, to earn another look with the big club.
AUGUST 27, 2024 • ROTOWIRE
Activated, sent to Triple-A The Cardinals activated O'Brien (forearm) from the 60-day injured list Sunday and optioned him to Triple-A Memphis.
Impact O'Brien has been sidelined since he suffered a flexor strain Opening Day against the Dodgers, and he'll head to the minors now that he's healthy. The 29-year-old allowed two earned runs with a 5:4 K:BB over eight innings during his rehab assignment with Memphis.
AUGUST 11, 2024 • ROTOWIRE
Could be activated next week O'Brien (forearm) could be activated from the 60-day injured list next week after making two more rehab appearances with Triple-A Memphis, John Denton of MLB.com reports.
Impact O'Brien will make back-to-back appearances with Memphis on Saturday and Sunday, which would appear to be the final box he'll need to check before rejoining the Cardinals' bullpen. The reliever has been sidelined since suffering a right flexor strain back on Opening Day.
AUGUST 2, 2024 • ROTOWIRE
Starting rehab assignment O'Brien (forearm) will begin a rehab assignment with Triple-A Memphis on Friday, John Denton of MLB.com reports.
Impact O'Brien has been shelved since Opening Day due to a strained forearm but has finally been cleared for a rehab stint The 29-year-old has completed three live batting practice sessions and could rejoin the Cardinals' bullpen before the end of July.
JULY 19, 2024 • ROTOWIRE
Starting rehab assignment O'Brien (forearm) will begin a rehab assignment with Triple-A Memphis on Friday, John Denton of MLB.com reports.
Impact O'Brien has been shelved since suffering a strained forearm on Opening Day and has finally been cleared to begin a rehab assignment. The 29-year-old has completed three live batting practice sessions and could rejoin the Cardinals' bullpen before the end of July.
JULY 19, 2024 • ROTOWIRE
Could begin rehab assignment soon O'Brien is scheduled to throw live batting practice Saturday at Double-A Springfield and could start a rehab assignment next week if Saturday's session goes well, John Denton of ML...
Impact Saturday will be O'Brien's third, and possibly last, live BP session, as the 29-year-old reliever could start playing in games as early as next week. O'Brien hasn't pitched in a game since Opening Day, when he sustained a strained forearm. He'll likely require several rehab appearances before being activated.
JULY 12, 2024 • ROTOWIRE
Set for another live session Cardinals manager Oliver Marmol said that O'Brien (forearm) will throw a live batting practice session at Double-A Springfield on Wednesday, John Denton of MLB.com reports.
Impact O'Brien will throw approximately 20-to-25 pitches Wednesday, and if all goes well, he could be cleared to begin a rehab assignment with Springfield this weekend. The 29-year-old righty has been on the injured list since late March with a right forearm strain. He's expected to fill a low-leverage role out of the St. Louis bullpen once he's activated from the 60-day injured list.
JULY 10, 2024 • ROTOWIRE
Rehab assignment pending O'Brien will throw a live batting practice session Saturday and will begin a rehab assignment at Double-A Springfield on Tuesday if the live BP session goes well, John Denton of ML...
Impact O'Brien suffered a setback in his recovery June 23, but he's nearing a return to game action with Saturday's live BP his last checkpoint to clear before starting a rehab assignment. O'Brien has been shelved since March 31 but is on track for a late July return.
JULY 5, 2024 • ROTOWIRE
Set to throw bullpen O'Brien (forearm) will throw a bullpen in the next day or two, Lynn Worthy of the St. Louis Post-Dispatch reports Tuesday.
Impact O'Brien was shut down from throwing June 23 after reporting pain in his forearm, but he's resumed a throwing program and has a bullpen session scheduled. The 29-year-old has been on the IL since March 31 due to a flexor strain in his right forearm.
JULY 2, 2024 • ROTOWIRE
Shut down from throwing O'Brien (forearm) underwent an MRI on his right flexor tendon today, John Denton of MLB.com reports.
Impact O'Brien does not have any structural damage in his right forearm according to manager Oliver Marmol, though he will be shut down for a time being before returning to throwing down the road. The right-hander was placed on the 15-day injured list Sunday, but it sounds like he'll likely miss more than the minimum time. For the time being, southpaw John King was called up Sunday to replace O'Brien in the Cardinals' bullpen.
APRIL 1, 2024 • ROTOWIRE
Auditioning well in spring O'Brien has allowed three hits and struck out two without walking a batter over three scoreless innings in Grapefruit League play.
Impact O'Brien was acquired in a trade with the Mariners in November and added to the Cardinals' 40-man roster. So far, he's making a good case for a bullpen spot in 2024. Last season was his first good one at the Triple-A level -- he had a 2.29 ERA and saved 15 games for Triple-A Tacoma, but it remains to be seen how he'll adjust to major-league hitters in a larger sample.
MARCH 3, 2024 • ROTOWIRE
Outrighted to Triple-A O'Brien cleared waivers and was outrighted to Triple-A Tacoma on Thursday.
Impact O'Brien struck out one in a scoreless inning during his lone relief appearance for the Mariners in early May, but he was sent down May 8 and designated for assignment Friday. However, the right-hander will remain in Tacoma, where he's posted a 2.70 ERA and 1.60 WHIP in 10 innings over 10 relief appearances this year.
JUNE 2, 2022 • ROTOWIRE
DFA'd by Mariners O'Brien was designated for assignment by the Mariners on Friday.
Impact O'Brien had a brief stint with the major-league club in early May but was sent down after spending just three days with the Mariners. He's posted a 2.70 ERA and 1.60 WHIP in 10 innings over 10 appearances at Triple-A Tacoma this year but will lose his spot on the 40-man roster as part of a move after Roenis Elias' contract was selected by the Mariners on Friday.
MAY 27, 2022 • ROTOWIRE
Returns to minors The Mariners optioned O'Brien to Triple-A Tacoma on Sunday.
Impact O'Brien's stay with the big club lasted just three days. He made his Mariners debut in relief during Saturday's 8-2 loss to the Rays, striking out over a scoreless inning. The Mariners will replace O'Brien on the active roster with pitching prospect George Kirby, who was called up from Double-A Arkansas in advance of his scheduled start in Sunday's series finale with Tampa Bay.
MAY 8, 2022 • ROTOWIRE
Joins big-league club O'Brien was recalled from Triple-A Tacoma on Thursday, Daniel Kramer of MLB.com reports.
Impact O'Brien was acquired from the Reds in mid-April and will now receive his first look in the big leagues with the Mariners. The right-hander has appeared for five games for Tacoma this season and hasn't allowed a run over 5.2 innings.
MAY 5, 2022 • ROTOWIRE
Dealt to Mariners O'Brien was traded from Cincinnati to Seattle in exchange for a player to be named later or cash considerations Saturday.
Impact O'Brien was designated for assignment by Cincinnati on Wednesday in order to make room on the 40-man roster for Nick Lodolo. O'Brien pitched primarily out of the rotation for Triple-A Louisville in 2021, posting a 4.55 ERA with a 1.32 WHIP and 121:55 K:BB across 112.2 innings.
APRIL 17, 2022 • ROTOWIRE
Dropped from 40-man roster The Reds designated O'Brien for assignment Wednesday.
Impact He'll cede his spot on the 40-man roster to Nick Lodolo, whose contract was selected from Triple-A Louisville in advance of his MLB debut Wednesday against the Guardians. Along with Lodolo, O'Brien was among the cadre of young pitchers who was competing for a spot in the Reds' Opening Day rotation during spring training, but the 27-year-old right-hander was quickly removed from the competition. If he clears waivers, O'Brien will stick around in the organization and should be part of the rotation at Louisville, where he turned in a 4.55 ERA, 1.32 WHIP and 121:55 K:BB across 112.2 innings in 2021.
APRIL 13, 2022 • ROTOWIRE
Optioned to minors O'Brien was reassigned to minor-league camp Sunday.
Impact O'Brien spent the majority of the 2021 season at Triple-A Louisville and worked primarily as a starter. He racked up a 4.55 ERA and 1.32 WHIP across 112.2 innings in the minors and was rewarded with a spot start in Cincinnati to close the campaign. O'Brien could return to the majors as the season progresses if the Reds suffer injuries to their rotation.
MARCH 27, 2022 • ROTOWIRE
Sent down Thursday O'Brien was optioned to Triple-A Louisville on Thursday.
Impact O'Brien made his major-league debut as the starter in Tuesday's matchup against the White Sox, and he was charged with the loss when he allowed two runs on two hits and three walks while striking out two in 1.1 innings. He won't start during the Reds' final series of the regular season, so he'll return to the minors after Luis Castillo (personal) was activated Thursday.
SEPTEMBER 30, 2021 • ROTOWIRE
Gives up two runs in short outing O'Brien (0-1) allowed two runs on two hits and three walks while striking out two over 1.1 innings as he took the loss against the White Sox on Tuesday.
Impact O'Brien's MLB debut was not a smooth one after he started in place of Luis Castillo, who was placed on the family medical emergency list Monday. Both hits he let up went for solo home runs after Luis Robert went yard off him in the first and Yoan Moncada to lead off the second. He also struggled a lot with his command, throwing 22-of-42 pitches for strikes while walking three batters. The 26-year-old has also struggled with giving out free passes at Triple-A this season, so his lack of ability to find the strike zone wasn't all that surprising.
SEPTEMBER 29, 2021 • ROTOWIRE

Rodon scheduled to start as Chicago hosts Cincinnati

The Reds will start Sonny Gray on Wednesday while the White Sox are expected to counter with Carlos Rodon
SEPTEMBER 29, 2021 • Associated Press
Called up ahead of start O'Brien was recalled as expected Tuesday ahead of his scheduled start against the White Sox.
Impact The 26-year-old hasn't stood out at the Triple-A level this season, with an 11.2 percent walk rate inflating his ERA to 4.55, but he'll be called on for his big-league debut nonetheless. Cionel Perez was optioned to clear a spot on the roster.
SEPTEMBER 28, 2021 • ROTOWIRE

O'Brien scheduled to start for Reds at White Sox

The White Sox will send Reynaldo Lopez to the mound Tuesday and the Reds will give Riley O'Brien the start
SEPTEMBER 28, 2021 • Associated Press
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