Guillermo Zuñiga is a Gold 81 OVR Relief Pitcher card for the Mariners, part of the World Baseball Classic 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, Guillermo Zuñiga works with a 4-pitch arsenal led by a 97 mph 4-Seam Fastball and a 95 mph Sinker. His pitching ratings include 99 Velocity, 0 Control, and 77 Break. The profile favors a movement-heavy arsenal built to miss bats.

DiamondOps grades each pitch in Guillermo Zuñiga's arsenal: Slider (S), Sinker (S), 4-Seam Fastball (S), and Circle Change (A). 3 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 4-Seam Fastball, 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, Guillermo Zuñiga currently buys for about 647 stubs, with sell orders near 0 stubs. Over the past 7 days the buy price has climbed roughly 23%. Its quick-sell value of 300 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. Guillermo Zuñiga earns an OpScore of 58.4 on Legend difficulty, ranking #1989 among all cards and #328 among Relief Pitchers.