Riley O'Brien

Riley O'Brien is a Bronze 70 OVR Closer card for the Cardinals, part of the Live set in MLB The Show's Diamond Dynasty. He throws right-handed. The card was added to Diamond Dynasty in April 2026.

On the mound, Riley O'Brien works with a 3-pitch arsenal led by a 95 mph Sinker and a 90 mph Slider. His pitching ratings include 99 Velocity, 56 Control, and 98 Break. The profile favors a movement-heavy arsenal built to miss bats. Notable quirks include Outlier I.

DiamondOps grades each pitch in Riley O'Brien's arsenal: Slider (S), Sinker (S), and Curveball (B). 2 of them grade S-tier, which is what separates a genuine out-pitch mix from a deep-but-flat arsenal. Its strongest tunnel pairing is the Sinker off the Slider, so the two share a release look. Its 99 mph Sinker adds a velocity bonus on top. Arsenal grades are the same at every difficulty — unlike a hitter's OpScore, a pitch mix does not re-weight as you climb.

On the Diamond Dynasty market, Riley O'Brien currently buys for about 62 stubs, with sell orders near 0 stubs. Over the past 7 days the buy price has climbed roughly 13%. Its quick-sell value of 25 stubs sits at or above the sell price, making it quick-sell viable. DiamondOps suggests waiting for a better entry point.

OpScore is DiamondOps' composite rating of a card's in-game performance value. Riley O'Brien earns an OpScore of 65.5 on Legend difficulty, ranking #1936 among all cards and #98 among Closers.

Live Series cards like Riley O'Brien's are the ones Diamond Radar scores: it reads a player's real MLB production and predicts what the next roster update will do to the card — the predicted rating, the tier jump, and how likely the upgrade is. Ratings only move at a roster update, and not every Live Series card is scored in a given window. Model v11: of the 358 cards it scored 70 or above in its 3 graded updates, 69% were upgraded, against 17% by chance: 4.1× better.