Sean Sullivan is a Common 61 OVR Starting Pitcher card for the Rockies, part of the Live set in MLB The Show's Diamond Dynasty. He throws left-handed. The card was added to Diamond Dynasty in June 2026.

On the mound, Sean Sullivan works with a 3-pitch arsenal led by a 91 mph 4-Seam Fastball and a 80 mph Slider. His pitching ratings include 59 Velocity, 58 Control, and 68 Break. The profile favors a balanced mix of command and movement.

DiamondOps grades each pitch in Sean Sullivan's arsenal: Slider (S), 4-Seam Fastball (S), and Changeup (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 4-Seam Fastball off the Slider, so the two share a release look. Velocity works against the card here — its 59 mph 4-Seam Fastball is slow enough to cost it in the arsenal score. 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, Sean Sullivan currently buys for about 6 stubs, with sell orders near 0 stubs. Over the past 7 days the buy price has fallen roughly 40%. Its quick-sell value of 5 stubs sits at or above the sell price, making it quick-sell viable. DiamondOps currently rates the card a buy at this price.

OpScore is DiamondOps' composite rating of a card's in-game performance value. Sean Sullivan earns an OpScore of 45.4 on Legend difficulty, ranking #3013 among all cards and #612 among Starting Pitchers.