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Riley O'Brien

Riley O'Brien

RP - St. Louis Cardinals

Age: 30College: College of IdahoBats: RThrows: RCountry: USA

2026 Outlook

Draft Rank (ECR) P #163
Best / Worst #118 / #118
ADP N/A

Roster %

 
Yahoo
7%
 
ESPN
2%

Eligibility

Yahoo RP
ESPN RP
CBS RP

Availability



Riley O'Brien earns save Tuesday

Riley O'Brien recorded the final out for the save on Tuesday against the Giants.

Fantasy Impact

O'Brien came in with one runner on and two outs. He recorded a strikeout for his sixth save on the season.

Ari Koslow11 weeks ago
Riley O'Brien secures save in tight victory over Brewers

Riley O'Brien struck out two batters and allowed one walk in a scoreless inning to earn the save in Sunday’s win over the Brewers.

Fantasy Impact

O'Brien, along with JoJo Romero, continues to see save opportunities for the Cardinals. After yesterday's game, O'Brien holds a 2.13 ERA and 1.18 WHIP with four saves across 36 appearances this season.

Nicholas Rodriguez12 weeks ago
Riley O'Brien (shoulder) has MRI return clean

Riley O'Brien's MRI came back clean.

Fantasy Impact

O'Brien, who is dealing with right shoulder soreness, has not yet been placed on the injured list. The Cardinals plan to have him rest until Friday, when he is expected to begin working his way back to the mound.

Nicholas Rodriguez14 weeks ago
Riley O'Brien recalled from Triple-A

The Cardinals recalled RHP Riley O’Brien from Triple-A Memphis.

Fantasy Impact

O'Brien has posted a 2.79 ERA over 19 1/3 innings out of the bullpen for Memphis this season. He'll work a middle relief role for the Cardinals.

Ari Koslow26 weeks ago
Riley O'Brien serving as 27th man Thursday

The St. Louis Cardinals have recalled Riley O'Brien from Triple-A Memphis to serve as 27th man for Thursday's doubleheader against the Kansas City Royals.

Fantasy Impact

O'Brien will likely be optioned after Thursday's doubleheader, but he'll provide the Cardinals with an extra arm. In 2.2 major league innings this season, he's allowed three earned runs.

Nicholas Rodriguez27 weeks ago