Riley O'Brien| Year | W | L | Sv | Hold | IP | H | BB | SO | ER | ERA | WHIP | Rate |
| 2026 proj | 3 | 3 | 11 | 8 | 57.0 | 51 | 25 | 58 | 24 | 3.79 | 1.333 | 22.7 |
| 2026 | 1 | 0 | 1 | 1 | 4.3 | 4 | 0 | 4 | 0 | 0.00 | 0.923 | 86.3 |
| 2025 | 3 | 1 | 6 | 6 | 48.0 | 33 | 22 | 45 | 11 | 2.06 | 1.146 | 36.4 |
| 2024 | 0 | 0 | 0 | 0 | 8.0 | 13 | 8 | 11 | 10 | 11.25 | 2.625 | -10.7 |
| 2022 | 0 | 0 | 0 | 0 | 1.0 | 1 | 1 | 1 | 0 | 0.00 | 2.000 | 0.7 |
| 2021 | 0 | 1 | 0 | 0 | 1.3 | 2 | 3 | 2 | 2 | 13.50 | 3.750 | -2.5 |
| Date | News |
| 9/09/25 | Cardinals closer Riley O'Brien returns home to face Mariners. Riley O'Brien realized a dream in 2022 when he made one appearance for his hometown Seattle Mariners. O'Brien didn't get a chance to pitch Monday as his St. Louis Cardinals lost 4-2 to Seattle, but he might get an opportunity Tuesday night when the three-game interleague series continues. "It's definitely weird to think about, but I'm excited to go back and hopefully throw some meaningful innings there," said O'Brien, who attended Shorewood High in the suburb of Shoreline, just north of Seattle. Source: https://www.reuters.com/sports/baseball/cardinals-... |
| 9/07/25 | Riley O'Brien finds late-inning home as avoiding IL pays off with win, save: Cardinals Extra. The payoff for the Cardinals' patience and attempt to avoid the injured list for reliever Riley O'Brien was his presence in the ninth inning of two wins this past weekend. Unavailable for back-to-back series earlier in the week as he dealt with some discomfort in his right shoulder, O'Brien and the Cardinals made the decision to see if extended rest would make him available without missing the mandatory 15 days on the IL. The weekend series against the San Francisco Giants was the test of that approach and whether the soreness would subside and he'd could contribute. A win Saturday and a save Sunday — and the Cardinals have their answer. Source: https://www.stltoday.com/sports/professional/mlb/c... |
| 9/01/25 | Cardinals shut down breakout bullpen pitcher until further notice. The St. Louis Cardinals shut down relief pitcher Riley O'Brien after the team received MRI results on his throwing shoulder. Source: https://sports.yahoo.com/article/cardinals-shut-do... |
| 9/01/25 | Cardinals shut down promising reliever with shoulder injury. While 2025 has not gone the way of the St. Louis Cardinals, the team keeps fighting to finish the season strong. A series win over the Cincinnati Reds has put the Cardinals almost back to .500, as they are 68-70 entering Monday's season opener against the Athletics. A series sweep would put the back over that mark, but St. Louis received a blow to its bullpen on Monday. MLB.com's John Denton reported via X (formerly Twitter) that high-leverage reliever Riley O'Brien has been shut down from throwing due to his right shoulder. Source: https://clutchpoints.com/mlb/st-louis-cardinals/ca... |
| 8/31/25 | Cardinals' Riley O'Brien might need IL stint after recent setback. The St. Louis Cardinals are weighing the possibility of relief pitcher Riley O'Brien and whether or not he needs to be placed on the injured list. Source: https://sports.yahoo.com/article/cardinals-riley-o... |
| 8/07/25 | Nerves? So 2024. In LA return, Riley O'Brien meets Cardinals' challenge, claims career firsts. Before this eventful week at Dodger Stadium, the previous time Cardinals reliever Riley O'Brien stepped off that same mound it was opening day 2024 against the Dodgers and “one of the loudest environments you can possibly have,” he said. O'Brien admitted later to feeling “a little rattled out there.” Back at the spot of his rocky debut for the Cardinals, O'Brien collected the first win of his major-league career Monday and the first big-league save of his career Wednesday. Instead of the baggage of a year ago, packed up with his gear for the flight back to St. Louis were four game-used baseballs from the win and the baseball from the final out of the save. Source: https://www.stltoday.com/sports/professional/mlb/c... |
| 7/31/25 | Riley O'Brien - St. Louis Cardinals Relief Pitcher. Arizona Diamondbacks Athletics Atlanta Braves Baltimore Orioles Boston Red Sox Chicago Cubs Chicago White Sox Cincinnati Reds Cleveland Guardians Colorado Rockies Detroit Tigers Houston Astros Kansas City Royals Los Angeles Angels Los Angeles Dodgers Miami Marlins Milwaukee Brewers Minnesota Twins New York Mets New York Yankees Philadelphia Phillies Pittsburgh Pirates San Diego Padres San Francisco Giants Seattle Mariners St. Louis Cardinals Tampa Bay Rays Texas Rangers Toronto Blue Jays Washington Nationals Pitcher Catcher Infielder Outfielder Designated Hitter Riley O'Brien #55 Sonny Gray #54 Matthew Liberatore #52 Michael McGreevy #36 Miles Mikolas #39 Andre Pallante #53 Gordon Graceffo #44 Source: https://www.espn.com/mlb/player/_/id/41509/riley-o... |
| 4/27/25 | In brief outing, Riley O'Brien creates moment he'll look to build upon: Cardinals Extra. Although his first outing on a major league mound since last September lasted just two pitches and one batter, Cardinals reliever Riley O'Brien came away with a moment he feels he can build upon. Promoted from Class AAA Memphis on Friday, O'Brien was summoned from the bullpen Saturday when the Cardinals led 5-3 with two outs in the seventh inning and while a runner stood on first base as Brewers catcher William Contreras was due up to bat. O'Brien, 30, threw two pitches to the two-time All-Star and got him to pop up on a 98.3 mph sinker thrown high and inside to end an inning Steven Matz started. Source: https://www.stltoday.com/sports/professional/mlb/c... |
| 4/25/25 | Cardinals make pitching roster move before Brewers clash. The St. Louis Cardinals have been struggling immensely on the mound, with their bullpen in particular having major issues late in games. Ahead of Friday's matchup with the Milwaukee Brewers, the team has called up reliever Riley O'Brien to hopefully give their pen a boost, as reported by Katie Woo. O'Brien has pitched well in Triple-A so far this season, striking out 14 hitters in just seven innings of work while allowing only three earned runs. The Cardinals have a 4.36 ERA as a staff right now, which ranks 23rd in the Majors. Source: https://clutchpoints.com/mlb/st-louis-cardinals/ca... |
| 3/31/24 | Cardinals place right-hander Riley O'Brien on IL due to right flexor tendon strain. The St. Louis Cardinals placed right-hander Riley O’Brien on the 15-day injured list on Sunday, dealing another blow to their reworked bullpen. O’Brien has a right flexor tendon strain, and the team sent him back to St. Louis for additional tests. The 29-year-old O'Brien allowed one run and one hit in the seventh inning of Thursday's 7-1 loss at the Dodgers. Source: https://www.yahoo.com/news/cardinals-place-hander-... |
| 3/20/24 | Relief pitcher Riley O'Brien made 'tough' time a potential turning point: Cardinals Extra. Even if Riley O'Brien had a crystal ball two years ago, he could not have foreseen the big league opportunity apparently within his grasp with the Cardinals. O'Brien, a former eighth-round draft pick of the Tampa Bay Rays, had been pitching for his third organization in 2022. A Seattle Mariners minor leaguer, O'Brien was with Triple-A Tacoma and, depending on traffic, between a one-hour or two-hour drive away from his hometown of Shoreline, Washington. Source: https://www.stltoday.com/sports/professional/mlb/c... |
| 3/01/24 | St. Louis Cardinals beat New York Mets 3-2 in spring training game. It was the kind of situation a manager wants to see in spring training. A pitcher competing for a spot in the bullpen, in this case the Cardinals' Riley O'Brien, came into Friday's game against the Mets with Francisco Lindor and Pete Alonso the first two hitters due up in the fourth inning. Source: https://www.ksdk.com/article/sports/mlb/stl-cardin... |
| 2/26/24 | Cardinals' Fireballer Seen As Dark Horse Candidate To Make Big League Club. Cardinals' Fireballer Seen As Dark Horse Candidate To Make Big League Club St. Louis' bullpen certainly is going to look different in 2024 Author: Patrick McAvoy Publish date: Feb 26, 2024 9:55 AM EST In this story: St. Louis Cardinals Who will be in the St. Louis Cardinals' bullpen in 2024? St. Louis has made a specific effort to improve the bullpen after a tough 2023 season. The Cardinals had an underwhelming 2023 campaign and inconsistent play from the bullpen and starting rotation is a massive reason why. The Cardinals have made a handful of additions to the bullpen and one "dark horse" candidate to possibly make the big league club is fireballer Riley O'Brien, according to MLB.com's Source: https://www.si.com/mlb/cardinals/news/cardinals-fi... |
| 11/07/23 | Cardinals acquire RHP Riley O'Brien for cash, claim Jared Young off waivers. The Cardinals are still circling the drain on the pitching market as they prepare to dive into a transformational off-season for the looks of the club's starting rotation. Before the purported big moves are made, though, we're seeing moves on the periphery of the 40-man roster from St. Louis to grease the wheels of the winter. The Cardinals acquired right-handed pitcher Riley O'Brien from the Mariners for cash considerations Monday, adding a 28-year-old reliever who thrived this past season in Triple-A Tacoma. O'Brien compiled a sterling 2.29 ERA in Tacoma. Source: https://www.kmov.com/2023/11/07/cardinals-acquire-... |
| 11/06/23 | Cardinals get RHP O'Brien in trade with Mariners, claim versatile Young off waivers from Cubs. The St. Louis Cardinals acquired right-hander Riley O'Brien from the Seattle Mariners for cash and claimed utilityman Jared Young off waivers from the Chicago Cubs on Monday to fill out their 40-man roster. The 28-year-old O'Brien was an All-Star for Triple-A Tacoma last season, going 2-5 with a 2.29 ERA. Source: https://abc17news.com/news/ap-missouri/2023/11/06/... |
| 2/28/23 | Teoscar Hernandez, Ty France hit back-to-back homers as Mariners outlast Guardians. Mariners catching prospect Jake Anchia broke an 8-8 tie in the eighth inning, launching a solo homer on to the berm in right-center field to give Seattle a lead. Right-hander Riley O'Brien, a Shorewood and Everett Community College standout, shook off a pair of infield hits to pick up the save. Powered by a pair of four-run innings to start the game — highlighted by back-to-back homers from Teoscar Hernandez and Ty France in the second inning — the Marines led 8-1 after two innings and 8-2 going into the sixth inning. Source: https://www.seattletimes.com/sports/mariners/teosc... |
| 4/16/22 | Mariners acquire pitcher Riley O'Brien in trade with Reds. O'Brien, a local product who played his high school baseball in Shoreline and started his college career at Everett Community College, made his MLB debut with the Reds in 2021. He was designated for assignment by Cincinnati on Wednesday, and now is returning to his hometown. Source: https://www.king5.com/article/sports/mlb/mariners/... |
| 9/28/21 | Three things to know about Reds starting pitcher Riley O'Brien. The Reds acquired Riley O'Brien from the Rays last season, and he has spent the entire year with the Louisville Bats.
     Source: http://rssfeeds.cincinnati.com/~/667802254/0/cinci... |
| 9/28/21 | Three things to know about Reds starting pitcher Riley O'Brien. The Reds acquired Riley O'Brien from the Rays last season, and he has spent the entire year with the Louisville Bats.
Source: http://rssfeeds.cincinnati.com/~/667802254/0/cinci... |
| 9/28/21 | O'Brien scheduled to start for Reds at White Sox. Cincinnati Reds (82-75, third in the NL Central) vs. Chicago White Sox (89-68, first in the AL Central) Chicago; Tuesday, 8:10 p.m. EDT PITCHING PROBABLES: Reds: Riley O'Brien (0-0, 0.00 ERA) White Sox: Reynaldo Lopez (3-3, 3.16 ERA, . WHIP, 51 strikeouts) FANDUEL SPORTSBOOK LINE: White Sox -179, Reds +153; over/under is 9 runs BOTTOM LINE: Chicago and Cincinnati will square off on Tuesday. Source: https://www.charlotteobserver.com/sports/article25... |
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