Riley O'Brien 2026 Fantasy Baseball Outlook: Closing Option For Rebuilding Cardinals
St. Louis Cardinals relief pitcher Riley O'Brien is projected to enter the season as the right-handed option of a closer-by-committee situation. The rebuild in St. Louis started at the trade deadline last year when the team unloaded Ryan Helsley. After that trade, O'Brien collected six saves while left-hander JoJo Romero logged eight. Both hurlers are back and expected to handle high-leverage roles in Oliver Marmol's bullpen. Stuff wise, O'Brien has all the makings of a quality closer. The lanky, 6-foot-4 righty throws a power sinker up to 98 MPH, which plays even faster thanks to his 90th percentile extension. More strikeouts would be preferred for a high-leverage reliever, but he does generate solid whiff rates with both a slider and curveball. His 22.8% career K-rate is respectable and when you factor in his sky-high 54.6% ground-ball rate it's easy to see him thriving in a high-leverage bullpen role. There's no question O'Brien can be a quality closer, but if the Cardinals split their limited save chances between two players, then O'Brien faces an uphill battle for mixed-league relevancy in fantasy. He's worth a late-round flier in leagues where saves are hard to find.
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