The Cardinals Have A Relief Ace Blossoming Before Our Eyes

O’Brien throws the pitch 58% of the time, and it has turn out to be the stabilizing power of his complete arsenal. The sinker first emerged as his dominant providing in 2024, however the 2026 model has taken one other step ahead. He is throwing it round 98 mph, including roughly an inch of horizontal motion in comparison with final season, going from 15.9 inches to 17.2 inches of run, whereas additionally killing about an inch of vertical motion.

That form provides him a energy sinker with actual east-west motion, and his means to constantly replenish the zone with it has been the important thing to his strike-throwing resurgence.

Everything else performs off that basis.

O’Brien pairs the sinker with a sharp sweeper at roughly 83 mph that will get round 17 inches of glove-side motion. When layered in opposition to the sinker, the 2 pitches create roughly 34 inches of horizontal separation, giving hitters two pitches shifting in utterly completely different instructions from related launch factors. That is a nightmare look, particularly when O’Brien is forward in counts and forcing hitters to guard in opposition to 98 mph arm-side run.

He rounds out the arsenal with a tight bullet slider round 91 mph. The pitch provides him one other onerous, short-breaking choice that tunnels effectively off the sinker with out shifting as dramatically because the sweeper. In apply, that offers O’Brien three distinct seems to be: the ability sinker to assault the zone, the sweeper to create chase and horizontal separation, and the tougher slider to disrupt timing and preserve hitters from sitting on the large two-plane motion.

This is now not simply a good early-season story, both. O’Brien has been among the finest relievers in baseball by means of the primary month of the season. He ranks third amongst relievers in fWAR at 0.8, behind solely Mason Miller and Louie Varland, and sits tied for second in baseball in saves. For a Cardinals bullpen that wanted stability, O’Brien has not merely offered competence. He has offered impression.

The Path Forward for O’Brien

ST LOUIS, MISSOURI – MAY 2: Pitcher Riley O’Brien #61 of the St. Louis Cardinals delivers a pitch in opposition to the Los Angeles Dodgers through the ninth inning at Busch Stadium on May 2, 2026 in St Louis, Missouri. (Photo by Jeff Le/Getty Images)

Simply put: Riley O’Brien has pitched like among the finest relievers in baseball. And not like previous flashes, this model is backed by a cleaner arsenal, higher strike throwing, and a function that lastly seems to suit.

That issues as a result of the Cardinals have been one of many greatest surprises by means of the primary month and alter of the 2026 season, and O’Brien’s excellence in leverage has been a main a part of that early success.